DATA REDUCED FOR NO REASON

i have dealt with such incompetency in my life with MTN, After fighting for months with them, im back to square one, i received an sms that from november the datA will be loaded on the 5th, suddenly my data is loaded loaded for 20 GIG INSTEAD OF 40GIG BUT THE MESSAGE STATE 40 LOADED , LOG A CALL WITH THE CALL CENTRE REF ***, QUERY CLOSED WITHOUT BEING RESOLVED.THE RE OPENED THE QUERY AND SAID I MUST WAIT ANOTHER 48 HOURS REF ***...IM TIRED OF MTN, ITS EITHER THEY TERMINATE MY CONTRACT COS THEY REALLY MESSING UP THIS ACCOUNT ALWAYS , IVE SIGNED UP FOR 40 GIG WHICH I HAVE BEEN GETTING ALL ALONG NOW THE CHANGE MY DATE AND REDUCED MY DAT