Message Blocking activated but I can't undo it

I am currently going through this and I'm seriously to the point of I'm done with T-Mobile after this. And it's a number that they assigned to me for my smartwatch since I had to add a line. It's really screwed up when they assign you the number but yet they have the number blocked and they don't even know how to unblock it. I literally was to the point of almost having a stroke I was so so pissed off and aggravated over it and then to top it off instead of getting the good promo for a free smartwatch and then the other one being $30 I'm having to pay almost $700 but yet they said I could take two billing cycles for the promo to show on my account. I've never ever had it taken two billing cycles let alone one full billing cycle for things to show up on my bill it's usually within 24 hours. And then the one line is not even showing a smartwatch so I can't even pair it to my phone and use it