DStv blocked my channels yet I paid

I have paid for my account on the 15th February using the EFT form of payment as I always do and didn't have problems before but this time around Multichoice is messing with me. Having paid on the 15th, I get home in the evening of the 20th my channels are blocked; when I check it is claimed that I have not paid. The following morning I get in touch with them and email them a proof of payment. I get offered apologies and my channels are restored. Again this morning 22nd I wake my channels are blocked again? What the hell is going on? I pay for DStv and I can't watch it? I'm ****ed off.