Numbers incorrectly softlocked

I have three contracts with MTN comprising of two cellphone contracts and an iPAD data contract. I paid R3831.79 on the 19th of May 2015. On the same day the proof of payment was send to the MTN customer care centre and they acknowledged receipt of the email. However, subsequent to that I have received numerous smses with queries on the same alleged outstanding amount and worse my lines have since been softlocked and the call centre is closed and the shop in Fourways. This is extremely frustrating that a multinational corporation do not have contingencies for a simple thing like a strike. Very dissapointed and will definitely be moving my business once my contract comes to an end.