No doubt, the Lessees are shown to have paid the enhanced rate of rent initially at the rate of 6,900/- per month till 31.12.2011 and at the rate of 7,935/- per month from the date 01.01.2012. However, the mere payment of the enhanced rent, by that itself, cannot be construed as the agreement for continuation of the lease or extension of the lease in perpetuity. This is for the specific reason that, in the very same Ex.D-6, the Lessor had stated that what would be continued by such an increase is only the monthly tenancy' _(emphasis supplied)_ , but, not the yearly tenancy. Ex.D-6 nowhere whispers about the tenancy in perpetuity or at least, for a period of 99 years. On the other hand, it mandates a periodical increase of the rent at a specified rate for getting the continuation of monthly tenancy only from time to time. As such, the word from time to time' which is used both in Ex.D-3 and Ex.D-6 cannot be construed as an automatic continuation of the rent in perpetuity as contended by the lessees. Therefore, the argument of learned counsel for the appellants that Ex.D-6 is a letter of mutual consent and it