DSTV SWITCHES OFF MY ACCOUNT ALTHOUGH FULLY PAID

I have received bad service from DSTV all the years I have had a DSTV decoder. They are lucky they the ONLY service provider, coz if they had competition you would have no clients. I paid my bill 2 Jan, then paid using the DSTV self service website an extra R130 5 Jan to upgrade to compact package. They never upgraded the package, and I had to call PayU to get the proof of payment, and they only upgraded on the 10th of Jan. Today my decoder is completely off and shows I am in arrears and now they want me to resend all proof of payments again. The January statement already reflected my payment on 2 January and the amount and I sent proof for the 5 January payment, yet they saying I did not make any payments for Jan. How can DSTV send me a statement reflecting the payment ON 2 JANUARY, then later say I didn't pay and I am in arrears? I hate DSTV, and only subscribe for soccer channel. As soon as I get a better portal for sports, I will be leaving DSTV completely.