International data pass calls dropped

Hola, 

Do you guys use T-Mobile aboard? I'm in Poland right now using international data pass. I have 5G most of the time on my phone and internet works OK, but calls show wrong phone number. T-Mobile told me to use WiFi calling, but when I call out to local numbers in Poland it does not show my phone number but random number from Germany, India, etc. Not even from Poland. Today, someone from US called me and on my phone it showed +31 country code.. Also, when I'm not in WiFi range I can't use WiFi calling and every incoming call is being dropped at exactly 5 minutes and 6 seconds mark. 

T-Mobile rep told problem with caller id name is on the receiving end which I don't think is true since problem is with phone number not name. Also, if he is right and number was incorrect on incoming call.. then it's T-mobile problem.. 

This is not the service level I was expecting on business account paying extra for data pass. 

Anyone has similar issues?

dArF1k