Disgusted

I bought a 2bar heater on 13/6/2018 one bar stopped working in Oct. I heard last month from a friend that the heater has a warantee therefore I took it (on my lunch hour) to Shoprite Bellville Voortrekker Road for repairs. I was told that the date on my slip has faded therefore they couldnt help me. Went back to work and decided to call and confirm this with the manager because I didnt known that if my slip faded i couldnt be helped and its not my fault that they chose to print on paper that fades!!! I was put through to the manager and she assured me that she could help me if I remebered the date. Confirmed with my previous partner and he told me I purchased the stove right after my payday in June. So today 08/01/2018 I went to Shoprite again on my lunchtime and I met the Branch Manger whose surname is Peterson who told me in a very rude manner that I didnt speak with her and that she cant help me. She told me that the reason why my heater wasnt working was beacuse I threw it around in my storage and that I shoudve brought it immediately when it stopped working. My question to her was if it didnt have a 12month Warrantee. While she was shouting at me another woman came who claimed that she spoke to me on the phone(pretending to be the manager) and that she will check on the system--I waited and the woman came back stating that she cant help me. I AM VERY DISGUSTED BY SHOPRITE I wasted my time money and energy,,, I will never buy appliances there!!!!!!