Worst servicr ever!!!!!!!!

My husband has been a client of cell c for more than 10 years with 5 contracts. Time for a upgrade went to cell c shop mokopane to book the phone. Went back later that same afternoon to find out that some one else is busy with a credit app on the phone that booked. After our upgrade was approved. Phoned cell c online to book the phone that we want. All went smooth. Untill cell c sent the wrong device. We wanted a samsung a50 and they sent a Hawaii phone. This was sent back via ram courriers. 3 weeks down the road with so many phone calls. I have screenshots were we have been on a line for 17 min for 26 min for 36 min for 51 min with cell c and absolute no answer. I have inbox msg to cell c. I have made my problem clear on fb. Now they give me 3gb of data and want me to be happy with this??? Data is not my problem. My problem is that we are able to upgrade it is our right to upgrade and cell cannot even correct a mistake that they have made. To this date no appropriate ferdback from cell c. In the mean time what happens to the incorrect phone and contract allocated to us?? This is really bad service!!! A very uphappy person on this side.