*****ing my money again

Hi, every month around this date whenever i purchase data/airtime it is depleted within minutes and every time i call i get given the run around saying i have a subscription which i proved last month there was no subscription, the guy i spoke to last month promised it would never happen again and credited me with 1gb data....but here we are again, all this is doing is reminding me to not renew my contract this year cause i have to suffer like this every damn month, can this matter please be corrected and can i please have my money credited back to me....i have had it with this unacceptable bs, while on the phone with a consultant Carmen Wentzel she placed me on mute for a whole minute without saying a word....she then lodged a query with ***, why does this issue occur every damn month at about this date....why?????