Bad service @ Game Galleria

Yesterday 29 September 2018 I went to Game @ Galleria mall in Amanzimtoti in Durban, to get help with a proof of payment for a cellphone I bought there last year 2017 end of January as I could not find it. I went to the customer care, the ladies there advised me to go to the cellphone section when I got there I was told that their system only keeps information for six months and automatically wipes it off however the lady said that she will try and see if there is anything they could find. I remembered that I had slips from perforate books and I asked if can we not look at those books since systems wipes information off. I even suggested if we check with insurance that I took up when I bought phone, I went as far as checking my sms and found one on the 27 February 2017 talking about my 1st instalment of the policy but that could not help either even though there was a guy by the name of Anele from Hollard. He then told me that Snegugu from Game said that they cannot help me. I find it hard that such a big company does not have record of a sale about a year ago. My biggest frustration is that they lady at customer care told me that the phone is still under warranty and they would have to send it to samsung themselves as I am having trouble with the phone and it needs to be taken to samsung for reapirs but they require proof of payment.