Pathetic Customer Service

Good day I have contacted MTN in February to change my debit date from month end to 15th

It’s June and I’m still having issues. I have contacted them several times and every time the data has not been amended on their system. This is so frustrating as I have to call them every month to remind them but unsuccessful Also when I call I hold for long and sometimes the call cuts and then I have to call again. Regards Aqielah