Have not been paid from booking

I have not been paid from booking since may for over 6 bookings and 7000+ euros. Have had at least 30 calls back and forth with what can only be called robotic answering and stupid responses. I would love to know what I can do that the last email communication said I would definitely see money in my account by the 18/10 and the money was sent n the 8/10 and now practically end of the month and zero funds. Should I forget my 7000 or sue you??