I get hit by such calls/emails almost daily.

How not to, is often easier than how to and I get fed up of the number cold calls that breach new GDPR regulations. Often they are clearly overseas calls, worse are local calls or number withheld. If I do answer the caller often gets into an argument re GDPR - you won't win.

Do not under any circumstances send (spam) emails or scraped from new domain registrations from outlook or gmail saying that you do

1. X
2. Y
3. Y

using a made up name that sounds as if from the country you are targeting and offering a call/skype. Such calls/emails instantly go into spam and block.

So having started with what not to do, try to reverse the what not, into what TO do.

Have a local presence, use real domains for email, use real names/people who KNOW what they are talking about and local issues/regulations..... Have a local website, written in native language, not second language, ideally have a local human presence. Make sure you know about the business you are contacting, rather than generic rubbish.

Finally, having used several such companies, they often promise more than they deliver, if so you will never get a second engagement. SO do not under any circumstances just say what you think the listener wants to hear, tell them the truth, even if it means you don't get the business this time.

Happy to discuss further...

Robin