Deposits on goods
Don't pay a deposit on goods unless you are certain you want them. The shop may be entitled to hold onto your deposit if you subsequently change your mind about buying. If you are unsure, always check with the shop before placing a deposit.
Remember too that if you pay a deposit and the seller goes out of business, it may be very difficult to get the goods or your money back. Individual customers are low in the order of priority if the business goes into liquidation or receivership.
In this situation, if you paid for the goods by credit card, contact the credit card company and try to cancel the payment. You do not have a right to have this done, but the credit card company may be able to do it for you.