monroe shocks

i brought new shocks for my hyundai i20 2013 8 months ago and then the left shock was climbing off from the pressed in rubber and then when i wanted to report it they told me it is not the correct shocks for my car which i dont understand because they give you new shocks once you supply youre vin number and then when i phoned the offices i get told there is no one to help me because there is only one person that handles it and everytime i phone back he is on leave