Brand New Faulty S10+ still been fixed for 4 weeks

bought a brand new S10+ from MTN Mall of Africa on the 18th of Dec 2019 , after two weeks the phone had stopped charging and is showing moisture content sign saying it cant charge ,the phone has never been exposed to water or fell , I took the phone to Samsung for drying they dried it but still the problem was not solved ,the phone is still not charging , I returned the phone to MTN mall of Africa on the 6th of January for warranty checks, till today I have not received any feedback or my phone back ,I am living without a phone which I am expected to pay for monthly,when I go to the store they only say its still on the que for repairs!!! so its been 3 weeks without a phone,mind you this phone is not even a month old when the problems started. I bought the phone on contract and I am paying R799 without the phone