Tmobile is blocking my website and support has been trash

Because of the way T-Mobile has implemented its infrastructure, a single IP address is potentially shared among many different users, and the IP address you're assigned at any given time is likely to change over time.  I won't go into details about their system, as it has been discussed at great detail in many posts here, but short of T-Mobile rebuilding their infrastructure (which has about zero chance of occurring), there is nothing customer support can do.  

The only solutions involve using a service that assigns you a permanent IP address, one that isn't shared with other users. It looks like your URL goes to a business website, so it may be worth your while to explore your options for getting a fixed IP address. T-Mobile offers a Business 5G internet subscription with an added cost option for a fixed IP address, and many forum users have used VPNs to achieve the same thing. You can do a search on the forum for "fixed IP address" to learn more about the issue.

Again, there is nothing customer support can do from their end to assure that you won't keep having this problem. A fixed IP address is most likely what you need.  We can blame customer support for not training agents to know what's going on with this issue, so that they can give you good advice on how to avoid it (e.g., getting a fixed IP address). But we can't blame them for being unable to fix the issue by filing trouble tickets. It's not just a problem for business users; gamers also run into this problem, depending on the games and equipment they use.