@Ladybird9
It sounds like you are having the same problem as me (and several others on this forum), in that your number hasn't been properly ported across from the old PSTN system to the new Digital Voice platform. I had exactly the same as you... able to make outgoing calls fine but people trying to call me could not connect (except, in my case, if calling from an EE mobile). I expect there are also BT customers out there happily making outgoing calls and unaware the incoming calls are not connecting. This could result in an event bigger problem because two BT "guides have told me that if this problem is left unfixed for more than 30 days the customer will loose their phone number and be allocated a new one, and it then becomes impossible to get the original phone number back.
The good news is that mine was eventually fixed. The bad news is that, just like you, I had to make multiple calls to 150, schedule a fruitless engineers visit, spend 6-8 hours on the phone to BT doing "troubleshooting" that achieved nothing, have faults raised and then "resolved" when nothing had actually been resolved and it took 2 weeks from the day my number was transferred to DV for the problem to be fixed.
It seems that the "Guides" who answer 150 calls are (for the most part) unaware of this "porting" issue which can arise when people are migrated to DV or how to recognise it. Also, many of those who are aware don't know who to turn in order to resolve it and/or aren't persistent enough in pressing the relevant back office team to fix it, leading to a lot of timewasting for the customer and for BT staff. I was eventually fortunate enough to have one of my 150 calls answered by a very experienced and tenacious "guide" who eventually managed to get things fixed. Hopefully, one of the moderators on this community will take up your case and it will be fixed for you soon.
By the end of 2025 BT is due to have moved all it's customers over to DV, which will mean a huge number of customers being migrated during that time. When issues like this arise, I hope BT gets much better at dealing with them (or avoiding them all together) otherwise it could lead to major problems with customer satisfaction, overloading BT customer service with fault reports and dreadful damage to BT's reputation (not to mention potential breach of BT's licence).
Good luck and I hope you mange to get it sorted out very soon.
