MTN Sout Africa, Cheating its customers!!

MTN South Africa, are cheating their customers, I had this account BA*** for more than 4 years, my account expired about two years ago since then i was using this contract as a month to month, I was always paying R369,00 for 700sms and 4,GB of data, since May my account data and sms suddenly changed, now i am credited with 200sms and 1,5GB of data but my monthly payment stayed the same that did not reduce. Surely that is *****ing from me. Maybe our government should start looking at how MTN is cheating their citizens. The MTN agent tells me the reason why the data and sms changed is because the contract expired, so why did it change when the contract expired and why is it changing again now???