HORRIBLE SERVICE - SAMSUNG ELECTRONICS

Almost 3 weeks ago I got up one morning and realized that my Samsung Galaxy Note 20 Ultra had a black/Blank screen, assuming the battery had died through the night I put my phone on charge, 30 minutes later it still hadn't come on, I then took the phone to a Samsung repair centre in Kramerville Sandton ( Amazing service) the ladies at the center helped me and booked the phone in, they called me the next day stating the phone has a default and it will be booked in for an exchange as it was still on warranty.

they provided me with the details for the Samsung electronics call center also provided me with reference details so that if I had to do follow-ups it would make it easy.

in the last 3 weeks I have made a countless number of calls trying to get assistance, eventually, they had let me know that the phone is out of stock and they will provide me with a store credit,

apparently a letter will be sent through to me advising on the credit as well ad the store that will be responsible to assist me.

i have made more calls trying to get them to assist me, every time I call they cant get through to anyone so they will call me back, that never happened as I have to keep calling them back to get assistance and feedback,

I currently do not have a phone and I am losing out on business, my clients cant even contact me.

i amso frustrated that I want to go directly to them and see them face to face but why should I if the problem and fault is on their side.

if anyone knows how better to get assistance from them please help me. do you also think I should call my lawyer and take legal action? I'm sure 3 weeks is a lot of time to do so?