spam calls and text message

About a month ago I started receive 15 spam calls a day and my scam shield was not active at the time and nothing was coming up like scam likely, I reactivated it and it didn't work there's no way to block a phone number that is spoofed and that's what I was getting and I'm getting tons of text messages from people I don't even know so I report them to spam and block them..  I had T-Mobile on the phone for an hour trying to explain the whole situation of what I was going through and they couldn't grasp the concept so they had to get their supervisor and told me that they were going to put something on my phone not to get these calls anymore and he said it was free but not according to my bill..

So now if they're not in my contacts they go straight to voicemail so I'm not getting those calls but I get notifications only.  Having caller ID is helpful.  And there's no way I'm going to change my phone number after having it for over 20 years