Groupon Cast Iron Pots

I bought a 7 piece cast iron cookware from Groupon. The pot lids came off before they could even complete 2 months from the date of purchase. I'm highly disappointed because, I bought them thinking they were of the highest quality. I sent a complaint to Groupon, and they requested me to forward pictures of the pots,to take it up with the supplier, of which I did. Till to date I have not received any response.