Disgusting behavior from Bears Alberton from management

My mother bought a bed and washing machine at Bears Alberton and it is on a cash back promotion they have running currently, 1stly when the bed was delivered, it was supposedly to spray with a certain spray for the mattress that was never done, it actually took them 2 days to come back and do that, then we were then told for the cash back that is due to my mother, they will tell us when we will get it, and they didn't, i had to call them to enquire about it... i was then advised to come collect it on the 06.05.2025 then they tell me that its actually going to be a voucher as my mother is a pensioner and that they have sent it via sms which is a lie...we haven't received that. I called Bears Alberton and spoke to their manager Portia who was little to being useless and arrogant when i enquire... she told me to contact the head office if i do have a problem as its not on them... they basically **** to reach their targets and get a sale... their service is absolutely disgusting.