When you block spammers outright for a long time, they stop calling you. But once they know, you are not blocking them anymore then they start back again at you in full force.
i hadnt been blocking them, as i hadnt set TC as the default dialer & sms app (as TC doesnt have call-recording feature that my phone's native app has), which is reqd for blocking to work. i'd just ignore the calls or atmost disconnect without picking them up after seeing the ID. some days back when i had uninstalled TC (before the present instance), i received one such call from an unknown number with no identifier, & in half-mind i picked it up thinking that it could also be a call of some importance may be, but it was a scammer, and despite me not wanting to, i regrettably ended up having a bitter verbal spat with the rascal upon which he disconnected. now in hindsight, IIRC, it is since THEN that i havent been receiving these fraudulent calls. a couple of times the usual loan calls may be, but not from these dregs. and now after uninstalling TC once again 3-4 days back, not even the loan & finance calls as far as i can tell. might be just coincidence as well. will be observing for a few more days..