Battery is not working after 2 months of purchase

I bought a new battery after 1 year, as the two I had were starting to give problems, not charging properly or I have to shake the Twisp before it would work. The new battery started giving problems when I charged it, it would only come on every now and then. I thought that it was just a temp problem. When I was at the shopping centre where I bought it, I experienced a lot of resistance.<br> I didn't have my purchasing slip with me, because it got wet and couldn't see anything on it. I explained it to the lady at the counter. She asked me when I purchased it and I couldn't remember if it was in Jan or Feb this year. I showed her my Twisp card and when she swiped it on the system she couldn't pick it up. She called their head office and asked them if they can pick up on the system when I purchased the battery. The person on the other side mentioned that it is not showing on the system that I purchased the battery at all.<br> What happened to the transaction? The lady asked me if I can remember who the person was I purchased it from. The person I bought it from, very sadly, passed away about a month ago. What now, that battery is at home and I cannot use it? Please help to solve this issue