Can't get payment out of them

We've been struggling for months to get a payment out of them. Keep on sending them the forms and codes they requested, then they say everything is ok.Then when you ask for status updates they have an attitude and say you have to wait 5 days for the process(It has been months since we started the process multiple times!). Then after 15 days they say something is wrong and you start the whole process again, we've now done this 4+ times. On the surface they product and plans look good,but every time you need to start dealing with them, or try using the service the whole thing falls flat. I would not recommend anybody use them, backoffice processes are very bad