Geberit India — concealed flush tanks

I have 7 flush tanks form gebrit. Frst couple of years there was no problem. But after that countinously one or the other tank keeps on leaking and the whole overhead tank and sump gets empty. Such a waste of water which no one can afford. I pay for tanker to buy water every week.

I have put in so many times the same complaint bt no one has been able to give me a proper reason for this happening. Neither are they able to fix it permenently. This is big problem with the products and their service.