Receipt for goods taken in for repairs.

Am so unhappy with regard to their Electronics section. I bought a JVC 10.1" Tablet in February 2022..the speaker and on off switch appeared faulty...it got worse. I took it in last week & after a phone call the salesman exchanged it for the same model. Within 24hours it kept cutting out. Back I went. They took it for "Repairs" as i never had the original charger...my problem was I was not given any repair slip or proof that they had taken it. The Salesman gave me my original receipt back & said that was proof... (NOT where I come from?) I said it was proof i purchased it but NOT that you now have it. He points to the camera over the counter & says thats proof. Eventually i demanded their company stamp on the back of my till slip & signature that they took it for repair. Grudgingly he did this at the managers office where some other woman was & was happy enough. It was mentioned in passing it won't get ******. It was not about anything other than everyone should receive a receipt when goods go for repairs!