I used to teach at LTC. They still owe me money fo...

I used to teach at LTC. They still owe me money for my Portuguese lessons. They promised me more than what they were willing to give, plus when asked for a increase due to hours preparing lessons since they didn't have their materials for teaching - unlike all the other languages schools i taugh and teach at - they refused and said that if i don't agree to their super cheap rates for teaching then i am to invoice them and be replaced.
When invoiced, they took forever to pay, and did not pay in full.

Even after my student asking them that they wanted to continue their lessons, i got offer to return at their cheap rates!!! No acknowledgement ever for hard work and successful students!

Then I found and contacted Mechtild Braxmaier on Linkedin. She is one of the owners, and responded asking me to invoice her - which i had done in the previous message - and then blocked me, never paid. Also when i email the school i get ignored.

MOST HORRIBLE TEACHING EXPERIENCE OF MY CAREER.
DO NOT RECOMMEND TO ANYONE.