Hindware Sanitaryware Collection [Hsil] — Damage Toilet Seat

We have bought two Box pack Hindware Toilet seat (Standard Closet) of white color in the month of OCT-2021 for our newly constructed house which got installed in month of Nov-2021 . Now one of the toilet ceramic coating has loosen its shine and there are some black patches are appearing all around and day by day they are increasing with every flush.

We have been using best of the cleaning products available in the market for keeping the toilets clean but still commode looks very bad.

We have bought the Hindware product as its a trusted brand and we have installed and used this brand product at our other house as well with no issue but this is the first time we are facing this issue.

Request you to please resolve this issue asap