Bad quality Plum shoes

I purchased a pair of shoes on the 2nd of Dec 2015 from Zando,I wore the shoes twice and the leather started peeling. I then lodged a complaint for the shoes to be collected to get replaced which was successfully done 8th of Jan 2016. Once again, the shoes started tearing & peeling from the sole. I lodged another complaint & the shoes were collected in Feb 2015. Zando delivered my shoes yesterday just to find the same damaged pair of shoes I sent back. I contacted Zando to ask for another replacement, & if not possible, to refund me. I was then told that the shoes were taken back to the supplier to find out if the shoes would still be \sellable\" & the supplier said no, they are not and therefore we can't replace it - hence why Zando sent back the same damaged shoes. I phoned & the consultant was not able to assist. I then asked to speak to a manager & was told that the manager would phone me back. YOUR supplier says the shoes aren't sellable anymore, but YOU are my supplier & not delivering a service. I am extremely unhappy about how you treat your customers & I will ensure that I & everyone I know, no longer supports you. Hopefully a Manager can call me!!"