Hello,
This is far from what anyone should have to accept.
First off you need to understand who actually has your number and there are some tests and checks that you can do.
1) Ask both suppliers to provide the CDR's (call records) for their last bills
2) phone the number you want to keep from a BT landline, and a couple of different mobile carriers (EE, O2. .) and note down which phone system rings; old or new.
Then Private Message me with the results and the following:
A) name of old provider
B) number you need to keep
C) name of new provider
D) address number was originally installed (before move)
E) your new business address
F) best contact number for you
Kind regards,
Stuart