Flipkart — microwave proof lid got melted like cheese.

Address:

Ajmer, Rajasthan

respected sir/mam, this month i did prepaid shopping from online portal flipkart. i purchased a set of three microwave proof bake n serve dish. one was having the glass lid while the other two had plastic cover lid. i was not happy to see plastic lid. but it was quoted that it is microwave proof. so i trusted because it was of well known brand borosil. i trusted and yesterday i started using it. i put stuffed tomatoes and covered it with that plastic lid. thinking that what if it melts. i gone through the manual again. it stated microvawe proof. After so much assurance i put it in and within 3 minutes i smelt something bad.. i came running in thought sabji jal gayi then asked mom aapne lid kab utaara... mom was surprised i yelled to see that plastic was all lost it melted like a cheese and completely transparent...i hand to hand switched offf my microvawe. now where.is my mistake? i paid good amount. i used cautiously... what the manual said that..why they quoited its microvawe proof? obiviously one will not invest so much for show off... if i wanted to use it for such purpose ke vo jale na to fridge me hi rakhne ke liye me aur kuch managa sakti thi. they sent me very poor quality plastic which is not at all mocrovawe proof... help me plsssss