Ackermans sold me a s**** phone

I recently bought a Samsung phone A05s at Ackermans cellphone store on 06 of September 2024 on installment,I was only told I qualify for Samsung A05s only which was not a problem until the next next Tuesday the phone began to show shading apps on the side and I realized I no have a receipt so I went and told them the situation,I was within seven days period but with no receipt so they rejected me.Now the phone has gone too far the screen is showing lines and it's now darker,as I write this review I'm very disappointed because I feel like they only gave me this Samsung to get rid of it,I have 12months installment awaiting for me to pay this phone yet the phone is already needing a new screen withing the first month.I called the customer service hoping they could help but they also said there's nothing to do because they can't reprint the receipt so now the ackermans phone problem is now my problem to fix and I still need to pay their monthly installment!...I'm very hurt by this situation