MTN did me wrong

I bought airtime several times without it credited to my account,this time it did not go well bcos i felt into the soo called extra time option that I don't even know how It was activated ,soo on the 8th August I bought 100 rands airtime using my capitec Acc ,it was not credited into my my MTN but dedicated from Acc,so I decided to buy data not knowing my data will pay the extra time that I don't know how iam owing,I called the customer care and I was told to check in two hours,I did but nothing,the next day I called still nothing ,today 11th I was told the system is slow but they will call me back for findings,i waited the whole day but still nothing,I called back to find out myself but still nothing,I can't buy data and I can't buy airtime bcoz iam scared now that it's either not credited or it pays extra time,I almost bought another service sim card today.