Verbal agreements hold legal standing but are hard to prove/enforce.I'm no legal expert, I would check if verbal agreements made during a lease can be changed to your detriment.
A path I would encourage you to look down, is how long you have been relying upon that particular agreement for and how consistently you have been dealing under said terms (within your previously signed lease). If it's not something that has been explicitly written down into the contract but has been relied upon consistently since the conception of the contract then it could formulate something known as an 'implied term'.
Established implied terms, providing they are not legally 'unfair', are legally enforceable and are known as 'conditions'. Worth having a Google about here if you're thinking about terminating the lease early and this comes at a cost to you.
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