Stuck with a faulty phone

I had bought a new phone at Ackerman's Carlton Centre on the 13th of August 2022 used the phone for 2 days and realised it's slow the touching is not great buttons need to be touched 3 times for it to type what you want, the speaker is so low and it overheats when in an app like Facebook or so. I went back to the store before the 7 days time frame and I was told they do not do exchanges or refunds I must buy a new phone so I am now stuck with a faulty phone. It's only been 7 days today using the phone but I have had enough already. The customer service I got was very bad I should say .