Geberit India — New Concealed tank water leak

Address:

No 1108, 5th Cross, K N Extension, Yeshwanthpur

I have bought 3 concealed tank for my new house and installed them in my bathrooms one of the tank, water keeps leaking inside my camode. I did opened ticked day installed sometime on Dec 4th 2020 G[protected]. After multiple folloow up engineer came in and he closed valve inside tank and mentioned once you start using and flow of water pressure is intact it will not leak.Now I am planning to move into my new house and found that once after valve opening it keeps leaking when tank is full. I need your help to get it fixed.. Kindly send some technician who is good and knowledgeable than like one who came in last time and mislead.