Irrespective of reporting such calls to 1909 and carrier and even using TC, the spamming happens. The moment the spammers sense they have been blocked, they resort to a newer no. and this goes on. Getting a new no. is as simple as abc at least in India and then we have those vpn calls where there are endless possibilities such as the new whatsapp spamming.
I used to report spam to 1909/ carrier couple of years back but have totally left it since then as spam is the new world which cannot be totally ignored and is now a part of our lives. Accidentally or purposely you have to attend one of such calls.
Back in golden rooting days there were few modules which used to block spam nos. with ease but sadly now no more root and so TC is the only way.
Worst is robotic calls which are growing at a rapid rate.
Also, spamming/spammers are active at their best on weekends as if they have signed up for weekend working jobs.
The best option I used in TC is block all except phonebook but sometimes have to toggle that for deliveries/ola/uber etc. when the person directly calls for a valid reason.