Dishonesty on product description

The prices at Mr Prices keeps attracting me, I should have learnt my lesson thus far, so this my story. I have recently purchased a sleep set for myself from Mr Price online. Why is there so much dishonesty in your product discription? My son can not be around anything but cotton, hence I have been only purchasing cotton clothing, the product description states the sleep set is 98%cotton and 2% elastane, my helper decided to wash the items purchased without me telling her to, when I checked the product to my horror it says polyester on the tag. I just wish I could attach pictures, I have emailed Mr Price Group, I have gotten no response