Terrible service at the FIX store !

I have been to the fix 1 day ago to purchase an item but it needed to be returned. When I got home I tried calling the store numerous times to inform them of the return but there was no answer. When I got to the store the next day the lady at the teller told me she has no money in her till to refund me and I’l have to come another time. So I then had to look for something to replace the item as I was in a hurry after going back for the second time. after finding an item the lady at the teller tells me that I have to wait as she needs authorization from the supervisor who had gone to pep. After waiting 10 minutes I asked the lady if the supervisor was on break to just leave the store during working hours to do her personal stuff. She said to me she was not on break and I continued waiting. I waited for over 20min and the supervisor finally came back from her shopping just to exchange 1 item !! Whilst waiting I also saw the phone and asked the teller why do you have a phone if no one picks up and she says cause the volume of the phone is to low so they can’t hear ! But the reason why they cant hear is cause their music in the store is to loud !! What’s the use having a phone ?? Now I need to go back as I’m not happy with the item because I had no choice but to take something else in the rush and I’m afraid they would say to me again there’s no money in the till. And I tried phoning once again to tell them I will be coming and they need to make sure they hav cash in their till but there’s still no answer yet the line rings ! Absolutely terrible for such a big shop.