helton@tawk2me.net is sending me sales text messages. Are they just 8messages or are they phishing?

Sounds like it's phishing or SPAM.

Forward the messages to 7726 (SPAM). At least for the first one, T-Mobile will text back an acknowledgement that they received it and they'll take care of the rest.

If you continue to receive more such messages, also forward them to 7726.

The more information T-Mobile receives about those and other phishing or SPAM messages, it helps every customer.