he is a consumer as he has bought flat for residential purposes . he is always at liberty to give flat on rent
2) you have to file case before state commission
3)
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consumer court at the district level
Consumers can register complaints against builders at district-level commissions if the amount of the transaction is up to Rs 1 crore.
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Consumer court at the state level
Consumers can register complaints at state-level commissions if the value of the transaction is between Rs 1 crore and Rs 10 crores.
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Consumer court at the national level
A consumer can submit a complaint with a national consumer court if the value of the transaction exceeds Rs 10 crores.