CELL C N1 CITY are *****!!

It took me an hour and half to upgrade my contract at n1 city branch on Friday 25 May due to the consultant not knowing what he was doing and constantly needed help from people that were busy with their own clients. The line was finally upgraded and i left the store. The moment i got home i moved my apps and pictures etc. to the new phone P20 lite. The phone immediately started heating up around the camera, i left it to cool down and then proceeded to test the device, i played some games, the phone heated up. i left it to cool down again, then i tested the camera as its the main attraction and within a minute the device was hot again. I wiped my information off the phone and put it away. The next morning i took the phone back to N1 city cell c and informed them about the issue im having, i was advised to play with the phone over the weekend and return it the Monday, They will send the device away and will be given a replacement device which i immediately said NO i want a new device as this one is faulty, i will not have them fix it and return the same device back to me, i was told i will get a new device within 2 weeks????? When i wanted to know why 2 weeks why cant it be done immediately i was then advised they do not have stock and i purchased the last device the Friday. Today is Monday and i played with the device as much as i could but the heated up of the device made it rather difficult, i have not moved my information over to the P20 lite again nor did i download apps just updated what was on the device. I asked my friend to call in and spoke to a guy Marius, she was interested in opening a new contract, she asked if they have stock and was advised that they do. THEY DO HAVE STOCK YET I WAS ADVISED THEY DO NOT???? IF I DO NOT GET MY HANDSET TODAY WE ARE GOING TO HAVE REALLY BIG PROBLEMS