I regret this

If possible guyz please do not take contract deals from this guyz, I was offered a data simcard by one of their consultants unfortunately I was mislead and given false information for me to accept the contract, I was told that the MTN sim is a universal simcard that would be able to transfer data from MTN to my main simcard Telkom, I asked the consultant more than once if this was true as I cud not afford a router at the moment and I had no dual phone to accommodate the mtn simcard, more than once the consultant assured me but upon going to MTN store to ask if this was true I was told this not possible so I have been trying to cancel this contract with mondo I am unable to get through as their phone just play music all day long till my airtime runs out, I ended up asking for help from MTN Official page on Twitter, they tried assisting me and told me that they have put an cancelation order with mondo and that mondo would contact me but it's been a week now am waiting, debit order's have started going off for admin fee for what exactly?? Because this contract is void I was mislead nd given false information why should I pay for admin and cancelation fees??