*******ly forced into paying high contract

My contract expired on 14 December 2014. I tried to downgrade my contract to al lower package but was unable to as MTN had my account incorrectly listsed as a company account. I had moved my account into my name in 2013. <br> I sent numerous mails and went into the branches.<br> I was only able to downgrade my account on 25/01/2015 due to the MTN error.<br> I have thus been charged the amount for Procall 1000 until this date.<br> I have used minimal minutes within the limit of the now downgraded package.<br> THIS IS ******* as I am now paying for MTNs error. Must I take legal action - I have consulted a lawyer and MTN is in the wrong , if I take this to court MTN will be liable for all legal costs