Mtn makes mistakes and the customer has to pay

I have a router with mtn. Ive loaded a credit limit to assure my billed does not exceed a certain amount. They assured me this was done, yet their computer had a problem uploading data and now im suspended! Charges went off even though my router was unplugged. Now i have to pay my normal monthly fee and extra to get my free data cause otherwise they wont reconnect my line! Really mtn! Great way to treat your customers! No wonder everybody leaves and trust me, i'm also leaving. Rather find a network that appreciates it customers! Without us, your customers, you wont have a business!