Poor service Midas

I bought the battery from Midas Roodepoort 6 month down the line the battery dies. I call the store explain to them that I lost the receipt, the guy tells me it's fine I should bring the battery they will check. So apparently the guy cant check the battery it needs to be charged first. 5 days later he reports the battery is indeed dead but they won't help because I lost the receipt but ask how did I pay for the battery, I mentioned card payment and they still can't help. Did a little research turn out that the 3 stores that I visited said they can help if I lost a receipt for their battery. Only Midas wouldn't help.

My question is, what was the marking on the battery for? And how come they can't reprint the invoice?

That is very poor from them