Start sending emails until your client 's inbox has no more space. Call them on all their contact channels, repeating ad nauseam that you need to get paid.
Find a way to reach the top of your client's company pyramid, the CEO, the algeria whatsapp number data 5 million super boss, the royal family, the prime minister... whatever. When you find their contact, bombard their secretary with calls. I guarantee that if they weren't planning to pay you, they will. If only to shut you up.
It's -a little- sad
Normally points 1 and 2 would be enough, but if neither of them have worked you can always be a little dramatic.
Remind him that you have a family to feed and a kitten waiting for you at home… I don’t know, whatever you can think of that makes him feel the most sorry. After all, we are all human and if the client has a little bit of a heart… he will end up feeling guilty and opening his wallet. And if that still works…
Go to a lawyer
I know this option may be a bit unnecessary, but… if you think it is necessary, the option of going to a specialist in law and serious matters is there. Maybe letting your client know that you are going to get legal advice will heat things up a bit, but at this point losing that client in the future doesn't sound like a bad option either, right?
And finally, don't lose your patience. Having to go through this situation is a bit annoying, but experience will give you the clues to deal with all kinds of unwanted situations.
