If, before the fair rent is fixed, a higher rent has been paid, the reimbursement or adjustment shall be limited to the corresponding amount for a period of three years, immediately before the opening of proceedings for fixing that rent, to the amount paid in excess. The fee for registering rental agreements in the state of Kerala is charged at 2% of the rental amount. 1. Every lessee who makes a payment on the rent or advance is entitled to a receipt as prescribed above the amount paid duly signed by the lessor or his agent. . . .