Unauthorized construction by the builder in my apartment

Dear Sir/Madam,

I purchased a flat in Ayanavaram, chennai from a builder named Kundan Foundations for a cost of 6850000 and now after I took occupancy of the flat the builder has started constructing an additional floor on top of terrace with four extra houses and my car parking area was removed and a marked a smaller area.

When I checked with the builder he stated that he is constructing twelve houses so he has to accommodate 12 parking spaces so reducing my car parking area of 11x15sq. ft. to 10x10sq.ft.

When I checked with Chennai Corporation regarding the extra floor I found that builder has got no approval for the same and pursued an illegal constructions in my apartment with four extra houses.

So I had to intimate the concerned authorities on the same through the sources known to my knowledge.

But now the builder says my car parking is no longer valid even though I have a letter signed by him mentioning the parking area and the dimensions.

Also, the builder is yet to hand over the receipts for the payment I made and also the hand over certificate for my apartment and also yet to form a society.

When I checked with the builder regarding the issues I am facing, he refused to talk to me regarding the same and challenging me to take this matter with the court if I can.

Kindly help me resolving the issue asap.

The address of the apartment complex:
RASHEE APARTMENTS,
93 SOLAI STREET, AYANAVARAM,
CHENNAI 600023