Poor service MTN and Mondo

I had one of MTN service agents phone me in February 2023 to offer me a deal wich seemed unbelievable a laptop and air time for R100 per month. I received the laptop and it took a few days to get the sim card registered. once registered I confirmed the cost for the package which was over R400. I immediately returned the laptop which I had not used waiting to confirm the price. since then its been 5 months chatting to consultants from Mondo who can only say they waiting for MTN to de register the device from my account. I am still paying for the device monthly and phoned Mondo again today who say they have escalated my query to no avail. absolutely shocking service from both parties.