Unsatisfied

Good day I bought two phones last year July Samsung A20 and Sony experia at Foschini centurion mall branch,the Samsung gave me a problem it was displaying on the screen that the device is overheating and switches off, so I took it back to the store for repairs, and they booked my phone under warranty on the 19-02-2020 i understand the Covid 19 messed up everything, back to business now, they told me that my phone was sent to Samsung,Olrite wen they follow up at Samsung with my phones IMEI number its showing that the phone is under someone else name in which they is a charge to be paid, what I don't understand do I need to pay for some charges when the phone is still under warranty and am paying the insurance for both phones, when um complaining at TFG they sent me some Reference number but nothing happens it is such a bad service I ever come across at TFG stores after being a member wth them for so long