Incorrect billing and poor service

Mtn ...Please assist and I have billed incorrectly for a data line I migrated to month to month for only 20G at a R149 monthly cost but your upgrade failed on the network as per your consultants and I was billed R4500 for the passed 3months to which I didn't agree on. Logged numerous complains with customer service and on emails as well but this issues still not resolved hence all this was not my doing but your poor systems and service agents . I will not pay this amount as I am not liable for as per the package I took up which was only for R149 not this ridiculous charges ....please amend my bill for all those months and have my line reactivated so I can use what I agreed on....for access to my account or profile ...here is my ID no *** and contact number is *** . Can someone call me back and get this sorted before I escalate this matter to Icasa for further assistance .....asap