horrible customer service

I have been having a contract with MTN, since nashua mobile closed shop from 2014, now my frustrations started when MTN started to overcharge me, i tried calling several times without any luck and eventually drove to the head office in 14th Avenue on the 22 October. I waited 45mins, then a guy by the name of Neo attended to my query & realised that indeed they were overcharging me, he promised that i will be refunded my money (R400) in the next few days, to date I have not received my money.<br> <br> Then the same day, i was referred to Sphelele who was to help me to cancel my contract and migrate me to pre-paid, on the day he couldn't do it as i had airtime to the value of R300 which was going to be forfeited, he advised me that only the airtime will be forfeited not data. on the 31st I send him a mail to migrate, but i had 1GB of data on my phone. I later realised that everything was gone, I have been sending him emails asking him about my data but I am not getting any response. I'm really frustrated with MTN :-(