Samsung — Regarding repairing of SAMSUNG A50 S mobile in Samsung authorized care center

Dear Sir,
I bought Samsung A50 S for Rs. 18, 000/-. After 03 or 04 months my Samsung mobile is heating during the calling & charging and mic was also not working properly. I visited in Authorized Samsung Care Center on June 2020 due to nationwide lockdown in amid of pandemic Covid-19 and after taking 20 to 25 days my mobile was repaired by care center. After few days repairing of my mobile same problem was faced. then i was visit again in Authorized Samsung Care Center again repaired after taking 20 to 25 days. But the problem of heating and mic were neither solved by care center. details of services provided by Authorized Samsung Care Center is as follow
i) 1st Service is Motherboard changed
ii) 2nd Services is Mobile battery and mic changed

i thing Samsung serve me a defective Mobile. Kindly help me..