MTN and MONDO: WORST SERVICE PROVIDERS EVER

I am trying to cancel my MTN month to month contract (with LTE router) and they are making it virtually impossible for me to cancel. I have been calling MTN for about a week now and they route me from one person to another without any assistance being provided. The last person I spoke to on the phone said I need to go to the store to cancel. I went to the MTN store in Canal Walk, to be told by a consultant there that I am on their system, but I need to bring the router and cable in before I can cancel the contract. I went back the next day, and another consultant told me that he can't cancel the contract because I took the contract out with Mondo online, so I need to call Mondo and ask them to forward an invoice to me so that I can give the invoice to MTN. I called Mondo only to be told that I didn't order the contract through them. According to Mondo, I ordered the contract directly from MTN, so while they have invoices for me on their system, they can't forward those invoices to me. Mondo says I need to contact MTN for the invoices and I need to cancel with MTN. I called MTN again (they have no numbers to press for s cancellation department). The consultant who eventually answered said she would put me through to the relevant department. I was placed on hold for more than five minutes and still wasn't put through. My contract is still not cancelled!!!!!!!!!!!!!!!!!! MTN is the worst service provider that I have ever had the displeasure of experiencing. And Mondo is no better. If my contract is not cancelled as a result of MTN and Mondo's lack of co-operation, I will have to consider taking legal action against them