Airtime has disapeared

Opened a query in Mid Aug, it is now Mid now STILL NO FEEDBACK or worthy response from MTN Ballito. I have to repeatedly go in as they never answer their phones only for them to then check where the status of my query is. I upgraded my Top Up contract to an Anytime contract - and my existing airtime disappeared after about 2 months. Instead of the existing airtime being used 1st, my new contract free minutes were used then suddenly disappeared. It could not have gone on data usage as I connect to Afrihost and not MTN!!!<br> <br> STILL waiting for an explanation to where my missing airtime has gone too... MTN=*******<br> Please cancel my debit order , I will pay you when you resolve my query with a proper explanation and proof.