1. How do you say that you never agreed to this clause? Does the rent agreement not bear your signature? If it does then it is misconceived on your part to say that you never agreed to a clause in the rent agreement.
2. If no fresh rental agreement was executed after the expiry of the previous rental agreement and you have been paying the rent as agreed in the previous rental agreement then relationship of landlord-tenant exists and you are bound by the clauses which form part of the previous rental agreement.