UK Landlord Forum / Life

Dear Sirs,

I rented a flat from a big agent in London from December 2018. As agreed, I needed to pay a 6-month rent in advance before signing the contract and moving in.
I had paid in full, and both parties had signed the agreement on a later day. The rent covered the period from December 2018 till late June 2019.
Recently, after such a long time, the agent suddenly contacts me and tells me that I didn't pay enough rent in the beginning. they say they only received 5 months rent (instead of 6 months) in December 2018.
I really doubt it because the agent asked me to pay in full before signing the contract. I had confirmed with the agent in December 2018 after checking their account, and then we proceeded the tenancy agreement,
The agent now asked me to provide evidence of the payment... The problem is I paid part of rent by my card and I am able to track it, and the rest was paid in cash at a local bank... I didn't keep the banknote...
Since the person who signed the contract has already left the company, the agent now asked a new staff to "chase" me.
I have already told the person what really happened and suggest the agent check with their Finance Dept. However, they never told me whether they have investigated the missing rent internally but only send the same chasing email again and again.

What I have:
1, signed agreement by both parties. it shows "the first payment of £xxxx due on the signing of this agreement"
2, email history. the agent emailed the breakdown of the overall payment, and I replied I will pay in full by a certain date.

Please advise what I should do on solving this matter.

It is not clear if you are still living there,or have left.If the latter,I would just ignore it.I very much doubt if it will result in action being taken.Even if they do,I don't think they would have a much of a case from what you say.

I am still living in the property, unfortunately. 

No one works in that company for long, it's been 2 years and they couldn't find the former employee who's responsible for my case.