Cancelling data contract nightmare

Mtn has been taking me for a ride for a whole year now....I am trying to cancel my contract that now expired in July 2022....they put you through to their retentions dept when you call 135 for cancellations then you get cut off and have to call them back. Just now I asked a lady calling me about reducing my cost from the upgrades dept....the more I trying to cancel the more offers she throws at me....#ENOUGHSAID#GATVOL