online work related

What sort of guidance you require when you have availed services and when that agency is demanding consideration for your services ?

Directly speak to them and settle the issue with in yourselves.  If you have availed their services, you are bound to honour the contractual obligations, as it is you that approached them, believing in their services.

my dear friend.
have you searched the company name ?
they are fraud.
please ignore them, or tell them that you are going to file a police case for threatening for extortion of money through telephone...
plz don't say them even a single paisa