Poor Service

I have recieved the worst service in my life from MTN / Mondo. I cancelled my contract with them in May 2022. 21 Jun they collected their router and it was delivered to their central wharehouse on 22 Jun . They still try and debit me 1 July and 1 Aug. I can still not get an answer from one of the 2 companies as to when this matter will be resolved. It speaks of *********** people in these companies. All iget is a reference number RCO255695 and " it is under investigation "