POOR RESPONSE FROM MTN

I upgraded my contract with MTN in May, at the time of upgrading the contract I still had a positive data balance and a positive balance for calls. <br> I also use the MTN provided app to check my balance regularly and top up with Data bundles when I run out.<br> When I received my bill for the month my average bill had more than doubled as compared to my regular usage.<br> I spent some time trying to get through to the callcenter to query my bill.<br> It took some time to get a response as MTN was going through a protracted service strike however when I finally received some feedback there was no answer to my query and I sent several emails and spoke to various individuals.<br> MTN then cut my services and demanded I pay the amounts without ever addressing the concern or giving me an answer as to how I would be billed for data usage just after upgrading my contract and having \free"1Gig data and a positive promo airtime balance.<br> In an attempt to get my service reconnected I tried to make payment arrangements with MTN while still querying the erroneous billed amount. <br> Why was I was billed for data or calls outside the promo bundles?<br> """