Refusing to refund damaged baby walking ring

I bought my son a baby walking ring on the 18 December 2015 and it broke before the end of December 2015.I went to the shop to return it on the 10 January 2016 and they refused to refund my money or give me the new walker.Both the rear wheels were damaged and I was not aware when I bought it but i was surprised that it was not in a box when I took it from the shop. I was told that its the only walker available in the shop. The store manager said they cant refund because the walker is still under warranty. The store manager said I must wait for the walker to be repaired and they will give me a second hand goods after it has been repaired and he will phone me back on the 14 January 2016 and he never did. I feel that Baby Boom takes advantage of me as the customer and have no respect for customers as well.<br> <br> Very disgruntled customer