Dealing with ***** companies, so disgusting.

My contract was due for an upgrade and at that time I wanted to cancel it because of bad reception in our area. After several calls from MTN consultants clarifying the network issue that can be resolved by installing signal booster, I then decided to upgrade my contract. I received an email from MTN (***) with a personalized double value deals promo from my upgrade on the 05th of August 2021, where there was a hyperlink of 120GB (60GB day and 60GB night). I went through the upgrading process and my application was successful. Now if I may say, this deal is useless to me because I cannot use the data because of the reception. I was in contact with MTN customer care regarding this and after investigation it was noted that the current upgrade package that I have is a fixed LTE of which I do not have the reception for it. I was told by the MTN consultant to call retentions department to cancel/change it since well I was still in a grace period. Tried calling retentions to no avail and also send an email to them regarding the matter where I was told to call another funny company called Mondo. I was shocked regarding this because I though all alone I have a deal with MTN not some 3rd party companies. Called Mondo for days where I was dealing with clueless consultants until I decided to stop calling them because they were always telling me the same thing. During that time, I realised that the consultants are lying to my face, and I decided to ask them for a reference number and that’s when they started to be rude and unprofessional because they would end my call and a live chat after providing them with my id number. Since I have been complaining about this contract and I have noticed that there is no resolution for it. I am tired of the treatment that I am getting from Mondo’s consultants. I have also tried to call MTN customer service a couple of times where I was told that I should communicate with Mondo, and this for me was a red flag because i should be dealing with MTN not some strange company that I was not even aware of. My patience has run out and I am no longer wanting to be part of this circus. I would like to cancel this **** contract and also kindly refund me the money paid because I did not use any of the data that was provided. You guys think I am desperate to use MTN network because clearly, I am being treated like I do not have options. Imaging paying for something that you cannot use do to incompetence?????