VODACOM CLIENT SERVICE NON EXISTANCE

My wife was contacted over a year ago regarding a upgrade to her contract that was taken out. This upgrade was done in Baufortwest, we live in Cape Town, she has never even been to Baufortwest. We called Vodacom and was asked to create avidavid at the police station to state we where not in Baufortwest at the time, nor that she took out or upgraded her contract. it is now a year and I don't know how many months later yet Vodacom on a monthly bassis call her to tell her she owes for a contract, we then go thru the whole proccess of explianing the matter and letting the agent know this was a fruadelant activity on my wifes account and send them thru all the paper work we have, Vodacom at the time we reported this the firat time acknowladged that this was indeed *****. I have sent countless emails to VVM or VMM and Vodacom Legal department. but I am yet to recieve a response . What am I to do. do we go seek legal advice and take it further with Vodacom and then in the proccess claim for compensation from Vodacom for stress and time taken to deal with this matter.