Very Bad Customer Service

I've had a very difficult time with MTN of late. When going through to do my contract upgrade, I was given very little help regarding package availability and the benefits & differences with each one. When being told that I would have to forfeit over R2k of accrued airtime just to change my package to one with a slightly different data offering, I held off the process of upgrading my contract as this would be a loss of a large sum, which is already paid for. This is something I feel is highly unfair. When later contacting the @MTNzaService twitter account for further assistance, I received no response. After three followup tweets, still no response. This has left me with a very bad taste in my mouth with MTN's service and their regard for existing customers.