Hi,
if uou are still receiving estimated bills, can MPAS and National Grid You can get tel no's from local 'phone book or directory enquiries) and confirm your:
Ele - Meter Point Administration no and Meter Serial No
Gas - Meter Point Reference no and Meter Serial No
It sounds like the meters may be mixed up with neighbours or national grid/ MPAS have incorrect details from builders. If this is the case you will need to provide BG with correct serial no and meter reads for your property. They will probably also ask for your Plot no.
If the property has meters inside it's probably just details incorrect from builder.
If the meters are outside or in a communal area, it may be worthwhile doing a 'Test and Burn'. Either turn everything off and see which meter stops or turn everything onb and see which meter turns faster.
Hope this is some help.
Nikki
Nikki