DSTV Operational Inefficiency

I was awarded a 65+ age discount of R83.90 on my DSTV a/c – active for 4 mnths without problem - R83.90 being 10% of R839 DSTV Premium base charge (excl R110 access fee). On 26 Oct instead of discounting monthly charge they added R83.90 to my a/c. This after I called in on 14 Oct & advised of upcoming error charge that I picked up on MyDSTV. I received apology & was advised that it would be corrected. It was not corrected, & I was charged the undiscounted amt + R83.90 (so in effect R167.80 too much). I made contact (with TIM & YK) via DSTV Facebook Messenger & spent over an hr trying to explain problem, to no avail. I requested escalation & they asked me for proof of reward & copy of Ts&Cs. Their team appears to have no knowledge of the rewards nor access to details. The inefficiency is beyond belief. Still waiting for call from them.