Very bad service from mondo/mtn

I have had the worst experience ever let's start here 1)the day I got my phone delivered to me is the same day I get to hear the company is going to have us on sort time I than phoned in to Mondo and said I will not be able to afford the contract Mondo told me to return the phone to mtn right away so I did that was the 23/08/2021 I than was in contact with both partners mtn/Mondo everything is being handled and the case will be resolved with in 24 to 48 hours so ja it has not been settled I keep calling do not get the results sorted out and now I at hit with a big amount of R40 000 and my phone is blocked so I need this resolved ASAP can I be contacted on the phone ***