Write to management.
A few years ago, my wife was pregnant and we purchased a new buggy in said store. To cut a long story short, when the baby was born, we opened the box to find it full of broken toys. Took it back to the shop. They wouldn't accept it saying I had put the toys there and they actually laughed at me in the store. I had to restrain myself from strangling the manager.
I brought the issue up with their office, and 2 weeks later, I had a hundred euro voucher, an apology letter, and a new model of the buggy we 'bought'. The manager who worked at the store at the time has 'moved on'!