zoom text messages

[RS7]

I am new to zoom and set up an account just for family video calls a couple of weeks ago.  Since then, my contacts have received unexpected messages.

After initial set up, one contact received an email asking them to join a meeting with me - I did not send the email.

Today, I texted a contact and within a couple of minutes they got a message asking them to join a meeting. I did not send the message and when they tried to send it to me so that I could see what they received, the original text disappeared. 

None of my contacts phone numbers are in my zoom contacts and my account is not set to sync with my phone book, but I do have zoom installed on my phone but am not actually logged in.

Is this due to a zoom setting or has my account somehow been hacked?  Concerned these may be phishing messages as I am not actively sending them.