Account suspended 3rd time in 10 days and they can't explain why

It all started when I receive an email during November offering me a special discount until end of March to upgrade from my Family package to DSTV Compact at R295 instead of the normal R365. I phoned into the call center and asked for it to be upgraded from 1st of December. I paid the R295 on 30 November and as from 1 December I was on the Compact package. On 30 December I paid my R295 again but on 4 January I received a SMS that my account was R140 overdue (the R70 discount for December and R70 for January. I phoned the call center and the lady I spoke to said she new about the discount special and couldn't understand why I now had to pay the full amount. I asked her to put me back to the Family package to avoid future problems regarding this issue and she did. That means I actually paid R295 for the month and should have been refunded for only having the Family package which cost R235 but I didn't want to argue about R60. I paid the R235 on January 31 with an EFT as always and on 3 February my DSTV service was suspended. I phoned the call center again and was told that they haven't received any payment. I emailed the lady my proof of payment and was reconnected within 30 minutes. But on 8 February, my service was suspended again. Again I phoned the call center and the lady said she couldn't understand why it was suspended and reconnected it straight away. But then again this morning the 13th of February, I had to find it suspended again and I had to phone the call center again!!!!!! The guy said I was "probably" disconnected because I owe Multichoice R72.58, R22.58 for late payment with my payment only reflecting on 5 February and then R50 for the disconnection fee on 8 February. He reversed the disconnection fee but said he couldn't do anything about the late payment fee. As far as I'm concerned, Multichoice owes me money for cheating me out of the special to upgrade to Compact and me having to cancel the upgrade at the 4th of January but still paid for it till the end of January. Now they keep disconnecting my service because "according to them" I made a late payment but I have proof that I have paid 1 day before the due date!!!!!! But to try prevent more of these extremely annoying disconnections which I know is not my fault but their incompetence, I will pay the R22.58 right now. They know they have a monopoly but for our kids sake, we have no choice but to just accept their *********** service.