Please help. I am very pleased however got the wro...

Please help. I am very pleased however got the wrong seat/cushion. I needed a thick 4 inch gel foam. I recieved a 2 inch foam that flattenens out and does not cover base. My doctor ordered for lymphedema. I now have complucations. Sores!!!!! Nobody should have them from using a powerchair. Help me please!The mobility company has an appointment scheduled for more than a month away! I get it. They then wont cover what I ordered. I need your help.it was COVERED but I did not recieve.