6 months and battery is dead again

Hello, i bought a battery (Willard) at Midas East London, Bowls Road and before even finishing the 2 year warranty the battery had died. I took it back in April/ May 2024 and it was replaced but i didnt receive a receipt and i figured its because i didnt have one when i was returning it and used my bank statement as PoP now the problem is the battery is giving me problems again, i took it to Battery+ at Settlersway East London who did the testing in both the battery and the alternator and said the alternator is fine but the battery is finished and said i should go back to Midas to claim a new battery as i was suppose to get my receipt back as my new 25 months warranty was starting all over again from the date of replacement.