Willard Battery Express Gezina not willing to assist without slip but battery is marked with engraved date from them

We purchased a battery from Willard Battery Express cnr Ben Swart str and Steve Biko str, Pretoria on 21/12/2022 but now the battery has failed and they refuse to help us because due to unforseen circumstances we do not have the slip anymore. They insists that Willard demand the slip. They did not have a problem taking our money when we baught the battery but now that the battery is faulty they are not willing to accommodate us. I think this is daylight *******, a money making scheme by giving people batteries that are not 100% effective and then denying them help because they could not hold on to a slip, but they engraved the baught date onto the battery