MTN Corporate greed

I have two mtn phone contracts of which one expired last month, this morning both phones had been disconnected. I called Mtn and was then told even though I only agreed to a 2 year contract they had taken it upon them selfs to send more data and airtime to the expired contract and bill me and that they have the right to do so cause I didn't phone and cancel the contract that had expired? Then i informed them that i had paid and could they please now stop sending data and airtime. Shockingly no they cant cause the money isint reflecting yet so instead they will send me more data and airtime today and bill me even though i dont want it, have never agreed to it and i haven't used it. This after i recieved a call after the contract expired from mtn asking if i would like to keep on recieving the data and airtime to which i said no but according to them as it was the sales department that phoned me it doesnt mater that i said no cause sales dont cancel contracts. After asking to speak to a manager i was told the manager is just gonna tell me the same thing so there is no use. Thanks Mtn for turning a loyal customer thats never not paid into a cash***.