Poor Quality Shoes

I ordered shoes (Sarah J Weave trim Flat Sandals) on 20 November 2015 and only wore them for few days when I discovered that they were cracking and peeling off on the back. I sent them back in January 2016.They replaced with a new pair of the same shoes which I only wore Once and it started cracking again at the back, I again sent it back and wrote them an email that I do not need the shoe anymore they should rather give me another one of the same price or refund. Instead they sent back to me the same cracked shoe without communication which I sent it back and sent them an email again and on the 1 March they sent back to me the same cracked shoe without any communication of why they are doing that and I sent it back again. Today I decided to call them and find out what is going on and they are telling me that the shoe is not poor quality but it looks like it was hit against something and I ask why would I do that, can't they see the cracks on the shoe? but in all they are refusing to give me a refund though I explained that I never hit the shoe against anything I wore it for One day and it started cracking and anyone can see the cracks. Unhappy and regret ever buying from them.