The cancellation of my summer mobile contract.

around the 15th of December 2017 I received an package which had a sim card so I can use for my data from summer mobile, the reason I agreed to the contract was because the agent I spoke to, its unfortunate I cant recall her name, she told me my Huawei p9 had a dual sim I will be able to insert the sim card for data and my sim card which I have been using. As soon as I realized I would have to remove my sim card in other for me to use the other sim card. I called the mtn and they referred me to the summer mobile department and I was told that the contract had been cancelled. to my surprise by the end of Jan my phone got suspended because I had not paid for my subscription. the subscription I never had I never used. I had to pay that amount so that my phone can be uplifted I had called in many times in mtn for this to be resolved but no one seems to be attending my case. when I call the summer mobile they cant view my details apparently I don't appear in their system, I need answers cause clearly it seems like I am paying for something I don't know but mtn is able to suspend my phone but clearly they also don't know what I am paying. This is totally bad service.