Change User Number to Service Number

I am in the UK, and I have just managed to get Microsoft to port 5 user numbers to service numbers. It took weeks for them to work out how to do this but it is possible.

Further Information:

I had 5 numbers listed with British Telecom, which were ported into Skype for Business as User Numbers. When I informed Microsoft that these need to be Service numbers, they suggested that I port them out of Skype for Business and then port them back as Service numbers. This was not going to happen, as British Telecom would lock the numbers into a new contract. So this was given back to Microsoft to sort out.