I have a similar situation.
Ordered the UMG1831 on Dec 17th, Friday through eBay, got the tracking number the same day but was delivered only on Dec 23rd, Thursday. Tried it immediately and noticed the repeated disconnections and the device getting resetted every 1-2 minutes (Just like the device is being pulled out and connected back).
Notified dvdstoredelhi immediately and he asked me to send it back. I sent it back by DTDC the next day (Dec 24th) and the same was delivered on 28th. He supposedly tested the same modem for many hours and used it for downloading for about 4 days and finally said the modem is working fine according to him. Whereas I had tried it on 3 different machines and it showed the exact same problem. Anyway he finally said that he will send a replacement and it will be shipped by Jan 2rd, Monday
But it was finally shipped on Jan 6th only by DTDC from Bangalore, it was a return from someone who had ordered an extra. Anyway received the modem on Jan 7th and again the same issue further the device did NOT have an IMEI number as well. I had posted the details on his thread and now its a known fact that the recent UMG1831 batch had many defective modems.
I sent back the modem on Jan 10th and it was delivered on Jan 13th. And finally on messaging dvdstoredelhi multiple times got the refund for
Rs 2720 yesterday.
So I paid Rs 3000 on Jan 17th and I get a refund of Rs 2720 ( Additional expense of Rs 120 for sending the modem twice ), so effective lose of Rs 400.
He reduced the eBay fee of 6% which I don't mind and is acceptable. But he reduced the shipping cost of Rs 100 from him to me for the first modem as well and did not reimburse the shipping cost for returning the modem twice for an error on the sellers side! :no:
Your Payment is REFUNDED
Amount Refunded Rs 2720/-
Rs 3000 less 6% Ebay Fees Less Rs 100/- spent for Shipping via DTDC Insured.
Nett Amount Refunded : Rs 2720/
This is a case of DOA and the item was returned for no fault of mine and as the seller failed to deliver a working product which imo is 100% sellers fault. I expected a refund of the total amount minus the ebay fee plus the return shipping charges.
Am I wrong in expecting this, if the product was returned due to an issue on my side, or if I wrongly ordered the product, I can understand his terms and I am supposed to bear the shipping charges. But this is a clear clase of
DOA and improper testing at sellers side. I made a mistake of purchasing it from him on Dec 17th and today on Jan 17th I neither have a working product nor the full money back and at a
loss of Rs 400 due a
mistake/error of the seller.
What do you guys think?
I have purchased many items online and few items were
DOA or wrong product. The sellers in these cases promptly arranged for replacement and beared the return shipping costs as well, some even arranged for pickup direct from my house. And in one case as I asked for a refund, I got the
FULL amount refunded (was returned at their expense).
Further the modem which I had returned first, which he supposedly tested for 4 days, was sold to Freaky and he is facing the exact same issue as me. So much for his strict testing.
. 
. I urge all of the Huawei modem buyers to tinker as less as possible with the modems and the software and wait for dvdstoredelhi's latest batch to arrive. I hope dvdstoredelhi also gets these modems tested by a fellow senior TE member so as to testify his claim of all the modems are working fine.
