Reconnect my phones

I don't understand how I have to lose my connection and lose my daily business because of this incompetence from MTN. I paid my monthly bill through the app on the 1st of September and I woke to non functional phones on the 4th, this is just frustrating because when you pay through the MTN app, they send you an approval email and the second thing is their Huawei promo **** which is just a big lie, bought a new phone a month ago and I still don't know when will I get the mentioned Superbalist voucher