MTN has ruined my child's birthday

While people were enjoying #BlackFriday I was truly having a black weekend because of MTN. I woke up on Sunday to find R1095 deducted from my bank account for a R209 contract.

I have called the customer care line and been told it was a system error which happened in August. A system error which has cost me over R800! And since August why bill me now?! The messed up thing about their timing is that they deducted 3 days before my son's 4th birthday. I have made a cake order I can now no longer pay for. I am told I will get a reference number via sms and I must call again in 3-5 days to give that number to yet another agent who will then log a refund request for me. Why can this not be handled at first interaction?

I am so disappointed and stressed out. MTN has ruined my son's birthday