Telkom debiting for canceled contract

I requested a telkom contract (1 router and 2 Sims) through Mondo but I then decided to cancel before it was delivered because I recieved a better offer from another service provider. Mondo suggested that I reject the delivery as it was already on it's way which I did and they confirmed that the contract has been canceled (18 February 2020). Shockingly though Telkom says I have an active contract with them and keep on debiting money from my account( reversed most of the debits at a cost though). Reported the issue to them a number of times but they just kept on giving a new case number everytime. They even handed me over to debt collectors for services and goods I have never recieved. I wonder how they even rica'd the simcards without receiving my I.D and proof of res.