Bad service MTN

Hello Peter.... I want to complain about the service of MTN service provider I took out a router contract with mtn which ended in roundabout October 2019 At that time I received a sales call from Mobilesplus .... I am normally not a person that concludes anything telephonically but after the woman confirmed everything without me basically saying a word I agreed to then upgrade. She ensured me that my product would be delivered within 5 working days Up till that time till now I am still waiting for my router I have made numerous calls to Mobilesplus as well as mtn and even been in to the service centers In the meantime I am still paying every month for a product I did not receive I just can’t get the upgrade/ contract canceled Mtn has breach the contract with me and I have every right to insist cancellation Everytime I phone mobilesplus they informed me that the upgrade was cancelled and that I should contact mtn because the main contract is with mtn When I contact mtn they refer me back to mobilesplus I am now at a point where I’m loosing hope of ever resolving the matter Any suggestions as to where I should go with this .... onbudsman ?