MTN breach of contract!!! Rogue behavior

MTN you guys are rogues!!!! my contract that i signed with you states that i will receive my monthly Data and bundles on the 11th of every month, YOU decided to change the contract without MY CONSENT and give me my data and bundle s today, what happened to the balance of my DATA and airtime from today the 27th to the 10th of October? that is 14 days that you are robbing me off? if that is the case i want a 50% Refund for the month of September. this is appaling service you guys are breaching my contract and i will take this further and post on all social media and even make bill boards showing how big ********** you are. I want my money or my DATA bac****!