Whether the builder has given any written notice/cancellation letter, CRM people always act on behalf of management. It’s better you take all your payment statements and meet the management and explain them that you have not received any payment demand letter nor reminder. Request them to take back their flat cancellation decision, even after this they don’t do the same just issue legal notice through your Advocate and file the Consumer case against the builder. There is lot of such kind of cases are pending in Bangalore. Absolutely you will get justice. Madam, without seeing the documents you have booked the flat, Yes you can ask for certified copies of all the approvals from concerned departments, but before doing the same you should know what are all the approvals are available and required.
You can check the consumer court decision on the same issues in
confonet.nic.in & ncdrc.nic.in.
can you tell me the builder name