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if you are using an android phone please can you check the APN settings? Try setting these to EE’s presets if possible and give that a try. If you are using an iPhone, try resetting the network settings (you’ll need to re-enter your Wi-fi passwords).
If neither of these work and you have spoken to the mobile chat team, I can ask a moderator to try and help.
My phone is a Microsoft Lumia 640...and...no longer supported by Microsoft...I'm hoping you're not going to say that is the problem....it was OK to about 3/4 weeks ago!!....And...I love my phone...but very sick at Microsoft!!
BT Mobile is a MVNO (Don't own their own network), they use EE. BT Mobile do have their own settings but it has been known for them to get mixed up in the settings when an update has happened on the phone. The EE APN on some handsets allows wifi calling (not all) but I will include the link for all of BT's settings, as you will see its almost the same!