Welcome to the BT Community and thank you for posting.
I am sorry for the problems you're having with your BT Baby Monitor 6000. Your best bet to get this resolved would be to chat with the product helpdesk. I have included their contact details below: BT Video Baby Monitor 6000
If your product is within warranty:
By phone: 0808 100 6554
Monday to Friday 9.00am to 5.30pm
By email: firstname.lastname@example.org
If your product is out of warranty contact BT's recommended agent:
By phone: 0800 980 8999