Poor business practice

I was an independant assessor for the company for approximately two and a half years. I was told that I'd be paid a week in arrears for work carried out. I was paid on time in the beginning however I would experience payments problems ie. no payment or delays in payment. I received one of my payments three months after invoice date and after quering it SEVEN times. Problems with payment persist with them. I feel sorry for their policy holders and vendors having to contend with the companies inefficiencies. They are making the good name of the AA bad. Fortunatley I no longer conduct assessments for the company however I still await payment for work conducted in January and February 2022.