Substandard Egyptian cotton

So disappointed in Tfg, particularly with @home. I purchased a 230tc duck egg Egyptian cotton duvet & within my 2nd time of use the duvet is discoloured & have three shades of its colouration. I trusted @home as it had never disappointed me with quality before, & i threw away the receipt & only have a statement as proof of purchase. Since it has a 6 months warranty/guarantee i tried to reach out to Tfg customer services & the store where i made the purchase without any success. @home have always been my go to store with homeware products and furniture, but if they sell substandard products at high prices & fail to account to faullts & assist customers accordingly then they will lose customers.