Building work paid but Ltd co is saying I owe VAT

[helpwanted18]

I had a Vat registered Ltd company do building work with all written quotes etc etc. The final invoice was sent to me and settled once the job was completed.

A month later (after they have been back to rectified a few hick ups) they have said they made a mistake their side by not charging VAT on one of the payments and I owe them £500 VAT - which they say they have paid out last quarter.

I have asked several times for proof and a VAT invoice so I can claim it from insurance, which they have quite aggressively said they will not provide anything until I pay the outstanding VAT.

What is my best position and best course of action as far as I can see the final invoice had been settled, job finished and then a month later they say this

[ostell]

Why would you pay for something that has not been invoiced?

[QCKate]

I had a Vat registered Ltd company do building work with all written quotes etc etc. The final invoice was sent to me and settled once the job was completed.

A month later (after they have been back to rectified a few hick ups) they have said they made a mistake their side by not charging VAT on one of the payments and I owe them £500 VAT - which they say they have paid out last quarter.

I have asked several times for proof and a VAT invoice so I can claim it from insurance, which they have quite aggressively said they will not provide anything until I pay the outstanding VAT.

What is my best position and best course of action as far as I can see the final invoice had been settled, job finished and then a month later they say this

You are right to ask for evidence and a proper VAT invoice.