KETEX Men Multi Solid Regular fit Track pants

Item sent wrong by seller as I ordered two Pieces in single order but Its too small in size & both are in 2 Different size in length sent, black color is 2" inches small in length from White one!!
I am 5.11" feet height normal body, cotton quality is very very normal as per price its need much better in fabric quality.
I already complain it on Paytm about wrong item in 2 sizes sent by seller, but they are saying its non returnable but,
its issue of wrong item sent, so why I suffer for 2 different size item sent by seller even I paid right full amount !!
No action taken yet its already 20 days gone still I am Harass by not getting solution, writing complain again & again .. Now today is 28th EoD still complain not resolved, very bad service even calling customer Care number not connect.. Very poor service by PayTm don't buy products here. On Amazon I complain the wrong item they refund & replace by Accepting their mistake ! Very pathetic I am suffering its 3 weeks gone I complain !!!