MTN and Mondo play the blame game

I took out a contract on the 27 August via the online platform and dealt with Mondo Mtn online. I received the router a day later. It did not work. I called numerous times and was told to take the router to a MTN store. After 3 visits to the store and a swim swap it still did not work. I eventually had enough and cancelled the contract. I was debited on the 29 August, 04 September and the 04 of October for something that never worked nor was ever used. I have called over 20 times and get told by MTN to call Mondo and vice versa. It has become a frustrating process.