Blocked Line for internal Error

I recently received notice for an upgrade on my MTN contract. At the time MTN was undergoing a strike. In this time their system changed my monthly debit order to cash payments that had to made and upon my arrival at their East Rand Mall branch - shop 154 - they refused to open the doors due to the strike. The call centre had a recorded message whenever I tried calling, and their sales rep Delin M was not at all willing to assist. EVENTUALLY the strike ended and I went back to the same shop to find out what was happening on my account as they were not debiting only to find that they had had an increase which they now wanted payment on and had missed a month earlier in the year. I paid for what I was aware of and queried the outstanding amount on the 1st of August 2015 in store. To date I have not received feedback about this. I then upgraded my contract for my two lines and went back for the sim cards on Sunday 16th of August 2015, thereafter my lines were blocked. I then called the rep that assisted me Thembi, who explained to me what was going on and unlocked one of my lines. I now have spent he whole day trying unblock the second line and there is just no answer!!