Hi Ramsey, welcome here.
What a strange issue! I must be honest. I've never heard about this before, so i'm quite curious. If I understand correctly, most of the times you can't call abroad but if the call is being succesfull the recipient see a local phone number instead of your mobile number. It's almost sounds as spoofing. I would advise you to write a complaint and add more information like dates and numbers of the calls (unsuccesfull calls but also the calls where your real number isn't visible) and add some screenshots.