Refund of Goods

I went to Batter Center to take a Battery I bought just over a month ago , the battery gave me issues from day 1 now i take it back i don't want a new one i want my money back and they are refusing to give me my money back , i understand what the staff was saying but the law clearly states i have the receipt and i have the original packing and there is a fault with this battery its my first time making use of battery center and it has not been a good one , the law clearly states i can request either a replacement or a refund and i would prefer my money back as i have not enjoyed my experience thus far . CPA clearly states i have the proof of purchase and i have the product and all the original packaging and the CPA say there is a 6 months replacement or refund policy the staff were helpful and friendly no issues there i have the issues with their policy of me having to wait they mist first check that is bull the CPA states as long as i have original proof of payment and i have all original packaging i can either request a refund or replacement and as mentioned i want my money back i am more than willing to take this to court if necessary