Contract has ended but now i must wait longer to change to different service provider

After moving into my new house i found out that the MTN signal is very weak . I phoned Mtn to find out if i can cancel my contract and they said that on the 3rd of October my contract is over or due for upgrade . Well i went into a MTN shop in Secunda today to cancel everything and just move to Vodacom but they say i must wait until the end of Feb 2018 before i can do this . What is this *******? My contract is over so why must i now wait longer before i can move to another service provider ? No wonder everyone hates MTN i have been a loyal customer for years and now that i want to move you guys make it almost impossible . I feel like going to the bank and cancel my debit order so you guys cant ***** my money anymore like you are doing now .