Hello All

Me and my partner moved back to the U.K. after several years as I need to become a full time carer for my mother which is an allowance given by the government (Carers Allowance).
We found a suitable property via a well know agency on RightMove not far away from my mothers house.
I set out initial contact to the agency and advised due to the fact we wouldn’t obviously be able to be credit checked as not living in the U.K. and no employment check could be conducted as I would be a carer that I am happy to offer six months rent in advance plus standard deposit.
This was also repeated several times on the phone to the agent, and all went through and accepted.
We have now discovered a month in to the tenancy, when we asked the agent for bank details of setting up standing order for the future that we missed it written in the contract six months + six months. Which is not what we verbally agreed, and we can only afford to pay monthly after the six months.
I am unsure where we stand legally, as the agency basically show little interest and will not budge on the matter.
At the time of signing I was ill with covid and my partner was in hospital fighting for her life with covid which the agency were aware of. So yes I may of missed it, however I relied on what we agreed to be correct.
Are we likely to be evicted if we just start paying monthly at the end of the six months?
Thank you