Wifi failure

Am extremly disapointed at mtns service.i have paid for my wifi at the correct date.iv been xalling them since the month began and iv been sent from piller to post ..IV PAID, iv sent proof of payment to 6 agent who all escalated it to the banking department which seems to be doing nothing about it ..am dissapointed as i use this wifi for when i work at home or my children use it for homeworks.This is so inconviencing .my last sr number is ***