Halifax account

raz01

my Halifax account has been frozen, due to a bank transfer from another halifax account, which the bank is now saying is a fraidulant account.

my partner n myself sold some jewelry (my partner has been collecting jewelry,stamps,coins,old documents,anything really.for at least twelwe years.) we never advertised it,as it wasn't planned to be sold. we excepted a offer for a couple of items.and desided the quickest way wud be a bank transfer. except the bank wudn't do it straight away,until they'd checked both accounts, (it wud take em 17 hours).the man returned to our house the following day to finish of the transfer.which he did successfully.i was able to withdraw money straight away.so we were happy.
the man then returned the following day interested in all the jewelry.we excepted his offer.done the bank transfer straight away (for £3700.00) over the next 3/4 days withdrawn about 3 grand.about a week after goes cash machine n it snatches my card. goes in the bank to be told the account which the money was transfered from is a fraudulant account, i told the bloke wot id sold etc, but e wudnt unfreeze my account.
es now asked me to sign aload of stuff so they can ask third partys info about me, but why. ive not done out wrong.all my money is in my account, my wages etc go into it.ive not bin able to get any money wot so ever now for over a week.untill half term my son takes £2 for his dinner at school, i was unable to give him it.the bank are asking for info that i don't no. wot do i do?????????? can any one give me any advice please.

Edinburghlass_2

As this is a banking question rather than a reclaim question I've shifted it across here for better exposure.