INJUSTICE AND UNFAIR!!!

I am deeply aggrieved and painfully upset with MTN. The injustice and unfair ordeal has seen me pay from month to month for a service which has taken what was gained during the time away as soon as my contract ended and I moved to prepaid. My contract ended on 7 August 2015. I was not contacted before or after the contract ended with any offers or with any information (poor service and sales). During the time of my contract I had over R1000 airtime, 30 minutes of talk time and over 200 sms's which i had to my disposal even after the 7 August 2015. Since the contract was completed and I was not offered a new contract on a new hand set i therefore decided to move to prepaid as the handset is now paid for and the agreement has been fulfilled. I also was not using the airtime, data, minutes or sms's that I had been paying for at the time. The data did not accumulate so that had been the only part of the service i was losing on as the data just fell away from month to month. The rest all accumulated from month to month and reached to beyond the numbers stated above. Now when I would like to use what was paid for and gained during this time, I have it removed which is like *******!!