Did you ask to port your existing number when you changed broadband provider
which ISP were you with when you first received the phone number? Did you port it to EE when you joined them?
in order for the forum members to help please can you post the stats from your router (if hub enter 192.168.1.254 in your browser) and if HH5 then go to troubleshooting then helpdesk and if HH6/SH2 then advanced settings then technical log information .
Have you tried the quiet line test? - dial 17070 option 2 - should hear nothing - best done with a corded phone. if cordless phone you may hear a 'dull hum' which is normal
Someone may then be able to offer help/assistance/suggestions to your problem
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If your phone number was not originally issued to you by BT Retail, at your current address, or at an address connected to the same BT exchange building, then it would not normally be possible to keep your number.
If it was first issued by EE, then they would own your number, and it would not be possible to port it to BT.