DUAL SIM MISREPRESENTATION

I took out 5 business contracts at Constantia Village - Huawei P20 lite - dealing with Kulsum, Nadia and now Sonya. This phone is advertised as a dual sim phone, which I verbally confirmed with Kulsum. However, when trying to get these phones operational for our foremen, I have discovered that these phones are NOT dual sim when you get them from MTN. When I queried it with Sonya I was told that 'MTN doesn't do duel sim phones". Firstly, how is MTN able to modify a general phone feature without advising the customer that this is the case? Secondly, my contract is for two years - the phone then belongs to me - they must be legally bound to advertise their phones excluding the general accepted feature of dual sim. This is gross misrepresentation - and so far repeated phone calls have lead to promises to call back - managerial staff are missing in action. Do not deal with MTN Constantia.