My tenants have paid 6 month rent in advance ( as they did in the previous 6 months with no problems) due to them being students.

The Letting Agent is dragging its feet and will not release the 6 months rent to my bank account stating the tenants have to sign a form allowing this to happen. 

Previously there was no mention of the tenants having to sign a form.

Tenants have been in my property since 18th October and I have not received any rent payment, I have had many conversations with staff at my letting agents and they keep fobbing me off.

I am unsure as to what to do next, what would you do?

Thanks

Michelle