MTN unauthorized upgrade

<p>On 20 December 2014, I signed a 24 month My MTN Choice 100 mins package paying R520 per month. On 22 December 2016, I received an MTN statement by text message stating that the total outstanding balance for December 2016 is R760.50 for account number A ********** . When, I contated MTN Custromer care, they informed me that an upgrade was processed on 2016-11-23, and the new package is MtnChoice Talk +S at R739. n the day they allege that the upgrade wa processed, I was not even in the country (I sent MTN a copy of my passport and flight tickets to prove that). I did not authorise nor give consent for any upgrade and did not sign any new contract. They sent my query to their ***** investigation unit in January (after ignoring me for weeks) while they continued to debit my account with R760 every month. MTN's service is appalling.</p>