There is a strict hierarchy about who is responsible for paying council tax. I’m sorry to tell you that in the list, that comes down to you. Here is the list from one particular local authority but the rules everywhere are the same:
the issue is therefore between you and the landlord and/or the agent who is in breach of contract and the terms of the tenancy agreement and you need to issue small claims court proceedings against them to recover whatever money you have at to pay, which they have paid.
What is in writing and tell them that unless they refund you this money no later than 4 PM on Friday, 15 June, you will issue Small Claims Court proceedings without further notice.
The same applies to the other tenants and the more of you do this, the better.
You can easily issue Small Claims Court proceedings here www.moneyclaim.gov.uk
to be honest, I wouldn’t be wasting time on copious correspondence. One letter and if they don’t pay, Small Claims Court
Can I clarifying anything else for you?
I am happy to answer any specific points arising from this.
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