Reversed payment after settlement of claim

I was in a car accident in January 2015 and had to claim from my then insurers Affinity Underwriters. After sending me on a run around with obtaining various documents, they eventually process my claim and I was not even covered the amount that I was insured for. They deducted a large sum of money as obscure deductions that didn't make sense. Fed up and ready to be done with this claim, I accepted it even though I would have owe a shortfall to the finance company. The money was paid into the financing company and I thought that was it. A day ago I received a rejection letter from Affinity claiming that I did not pay my premium amount on the month of the accident and therefore they would not be covering my claim. They had already reversed the amount paid into the bank without even calling to verify these claims which are false. Affinity received their premium amount 2 day before my accident in January and now they are claiming they did not receive it. Proof of payment from my bank statement was sent and this issue has still not been resolved. Another delaying tactic. They are unprofessional and suspicious in their dealings. I am appalled and insulted in how they dealt with my claim.