This is not only me. Several users globally have reported the issue of call diversions or no sound in GSM calls in their Samsung Galaxy A33. A phone without calling feature is not a phone.
After I have sent my A33 for repair, changed the mainboard twice, the third time I requested the phone to be replaced but Samsung said it's a software issue and an upgrade had been performed. I did not get my requested information about which software was installed nor did they provide enough information about this issue. I took the phone and still this is the 4th time I still have this problem. My phone has been in the repair center since purchase in May up till September (5 months).
I took the issue to the Ministry of Commerce for enquiry and soon I am filing a case against Samsung after providing reports from another repair center that their software upgrade did no good at all to address this problem.
Anyone willing to get proper advise: DON'T BUY THIS PHONE. Samsung will keep you waiting till your warranty expires. It serves no good to get a pretty looking phone with decent specs but no proper aftersales service.
Thanks for sharing, I hope you get you problems resolved.