Well, I don't get development offers calls, maybe bacause I've provided a fake number on whois + they probalby don't have a gateway line in Bulgaria and such calls will get expensive for them too. By the way, blocking calls from India migh not work. Such spammers just like the support call centres have gateway landines (ot sure exactly how it is called in english) so the caller number is not foreign. Otherwise calling people on phone on other countnents would be costly.
I am using Gmail fo mail and the contact email of the domains gets checked trough it (and most of those offers go directly to SPAM), no significant volume gets in my mailbox.
Right now where I am I have an ussue with similar spammes who offer brokerage on stock and forex marets. Company ownership is public, so is the company contact phone...you can not provide a fake one, and in one-man busenesses it is oner's personal phone. I realise that on the othere side is usually some girl (often a student, my sister also tried this onse... for 3 days in total) who just tries to make ends meet, she knows I have (or used ot have) some business (no idea how large) and most probably we are in phisically in the same city.
Funniest so far:
1. I was not busy, so I let her talk for a while, giving random short answers just to keep her talking... "Excuse me, are you even listening?", "Yes, I do. I am not interested at the offer at all, but you have such a nice voice and I'd like to keep listening to it
", So... you just like my voice...
". Hags up and that company never called again (I think, these bastards change their company names on yearly basis).
2. I was busy... "Hello mister Xxx Xxx, we are calling from company WhateverSpammy... is it convenient to talk about...", "I am not interested and busy, I am sorry" (hanging up), (calls again) "How can you hang up to a lady ho calls you before even listening to her
! No genleman would do this, it is not manly! I hope that there are fewear men like you!!!" (hangs up)