Not liable for payment due to incompetence

My MTN contract expired on 24 October 2015 and on 12 October I requested my number be migrated to pre paid as I no longer needed to be bound by 24 months. On the same day a person by the name of Mmapula Malebe from MTN Retentions department, Reference Number: ***8, came back to me and wanted to know the reason, which I explained in detail. That was the last I heard from him. On 14 November I called them regarding my airtime that had accumulated over time and was told by an agent named Chad, who was extremely helpful, that said contract had not been migrated and that he would follow it up. The 16th November another email was sent and Sanele Nhlapho told me to contact the technical department, no details given, which was requested but no response forth coming. On 19 November I again sent an email listing all my queries in bullet point. On 20 November an agent by the name of Kelebogile Matlala emailed back and I was told that the contract had still not been migrated and that it took 30 days, to which I rep**** and forwarded all communications sent. No response from her either. On 23 November, I emailed team leader, Christopher Ebing. No response!!! A \read receipt"for all rec"""