That sucks. I'm really really sorry. It is totally understandable to feel desperately hurt and angry. I would too.

I guess there's (at least) two possible things that happened. Either she knew she was calling you, and the "callmeifyouwantorneedto" was meant for you, and she had a sudden brainstorm and said a random name... or she thought she was leaving a message for someone else and she uses that expression with other clients too, which I can imagine would be very hurtful indeed as I know how important special that phrase felt to you.

When my T makes mistakes (of the how-did-she-even-get-a-foot-that-large-into-her-mouth variety), it's because she's not being mindful and is trying to meet my needs when she doesn't really have time or space to do that. For example, she wrote something fairly outrageous (and at best nonsensical) in a text yesterday. When I asked her what she meant, she replied "that's why I should never try to write a text while getting out of a taxi while late for supervision!"- and I could literally see her making a quick decision to reply to me because she didn't want to leave me waiting any longer...

Thinking of you.