I maintain that if you're going to HR, do not talk to the TL first unless that TL brings it up first. Part of the conversation you should have with HR is, "How should I handle this situation?" Apologizing is good, but in this case it's just reinforcing the TL's behavior.
As a TM you are not supposed to be accountable for your TLs actions. If their actions directly affect you in a negative way as in this case, you should FIRST talk to your TL directly, SECOND go to HR. However going to HR first just because they might be on CA already is out of line. It is your ETL's job to be accountable for your TL, not yours.
The OP should focus on whats best for himself, and not necessarily the vendetta that others have towards Team Leads/Target in general. If the TL is really on CA already, thats irrelevant. If that TL texts the OP again after he talks to her, then he can go to HR and show documentation of both incidents. However I think it is in the OP's best interests to try and resolve this peacefully, and put it behind him.
There are a couple of things I disagree with here. First, how is the ETL supposed to hold the TL accountable if the ETL is never made aware of the situation?
Second, this isn't about vendettas. I'm a TL myself and have a good relationship with most of the other TLs and ETLs in my store. This is about a Team Lead being completely out of line. As I've already said, if it was just a case of being contacted off the clock, it's one thing. I've actually been cut slack when I was new in position for doing something similar (involving someone who had just started their 15 but I asked them to do something and THEN start break) simply because I wasn't aware of a particular rule. I am not out to get any TLs or screw Target in general. But having a TL who engages in this kind of behavior is harmful to Target.
Could a TM have a conversation with the TL? Sure. "Hey, I'm sorry I didn't let you know I was leaving. But I think it was very inappropriate for you to contact me the way you did." That's a valid option. But it could go badly. The TL might be receptive, apologize, and everything is cool. But if that conversation goes poorly and THEN the TM goes to HR, we've added unnecessary complexity to the situation. We could end up in a he-said/she-said scenario. One party or the other could misrepresent things that were said, purposely or not. Right now, we have hard facts. "I received these texts after I left for the day. I have not spoken to the TL about it yet."
I agree, the TM should do what is best for him. In this case, that is going directly to HR or their ETL before the situation gets complicated.