Poor service

I have paid my account on the 31th of July for August throug Pay U.My service get suspended every 5th day.Phone them every time And sent proof of payment,bank statements even the proof from Pau U that the account is been paid.It's been 2 months and still they can allocate my payment.I fed up with there poor service.It cost me a lot of money to phone them and every time they are so sorry but do nothing to allocate my money.I even called head office and sent e-mails to quiry but nothing.This is the most poor service I receive from anybody!