Line cut before due date by we africa.

I have had problems with this company from when they had to install my line, now they have cut my line 2 days before the 30 day voucher expires, and I am told I have to wait for 72 hour or just pay, this was said to me by thier watsapp agent even thought I sent through my Pop, proving I paid on the 27th,she insists the system says I paid on the 24th and there is nothing she can do.