Bad ,Bad service from Mondo

Hi I am Deon Emmanneul Oliphant my email adress is ***. A few weeks ago I contacted Hellopeter regarding poor services I received from Mondo. On their reply they promise me that they will terminate my old contract with Telkom . Today 5/5/2021 I was contacted by Telkom that my current services on my new contract is suspended due to money I owed Telkom for the contract that Mondo was supposed to cancel.The amount due is R3062.00 for cancelation. Apparently Mondo request the cancelation late. I would like Mondo to rectify their mistake because I received that faulty device on the 9th of March and immediately reguest them the next day and ask for another phone ,they were reluctant to issue me another device which subsequently leads to me terminate my contract .I must make it clear I never used the device,i never make use of the Telkom simcards that came together with the devices. So Mondo must please sort the isssue with Telkom because I did request Mondo during that fist 2 days after experiencing the problems that I no longer want to continue with the contract