Jet cellphone warranty is a big ****

I bought a hisense phone from Jet by the Newcastle mall during the month of March 2022. June 2022 the phone's battery popped. I searched the house n realised I lost the box which the phone came in however, I have every accessory that came with the phone. I sent a message on the jet Facebook page and asked if I would be able to get assistance without the box and the admin suggested I go to the store and I will be assisted. So I went yesterday. I had to stand there for 20 minutes whilst they were trying to fix their system, but after i explained why i was there I was told they would not take the phone for repairs firstly because my phone was not insured, I asked if the phone doesn't not come with a warranty or because of the box is lost the warranty has became null and void. Then the story changed to "they cannot take the phone because I lost the box " and I asked why because the phone has the imei number on it . the lady who was "assisting " me gave a rude response and said she doesn't know and that I was supposed to be told that I should keep the box by the person who made the sale. As you can guess I was not told about that. Anyway, she said she will call "3G" and ask what to do and then she will call me to advise me further! I waited for her call but it never came , so today my grandfather went back again and asked why she didn't call back and she stated that she couldn't reach "3G" and she sent an email to them instead and was waiting for a response. I think she is making it quiet clear that I will not get assistance all because of a box that they don't know the significance of. Its not been a full 3 months and I am still paying for this phone in question. Meaning we will continue to pay for something that is faulty , that I will not be using.

I am very upset , I am angry and very disappointed by jet and their phone.