On 28 December 2024, I bought a cellphone from Ackermans Greenacres and the phone worked well for some time

On 28 December 2024, I bought a cellphone from Ackermans Greenacres and the phone worked well for some time. A few months ago, the phone took the whole day to charge and when I took it to Ackermans Greenacres they said they can’t help me because I lost the till slip. I showed them the extract from my bank statement with the date of purchase, amount and their store name but they refused to assist even though I have the original packaging for the phone. I also have a WhatsApp message from their store offering me insurance for the phone. I would like Ackermans to check their records for the date I purchased the phone and print a duplicate till invoice in order to take my phone in for repairs. One of their consultants mentioned the issue might be with the battery but it needs to be checked. I admit to losing the till slip however I think the store could do more to assist me especially since they have a duty to maintain records and to ensure their customers are satisfied with their products.