I had problems with them over a year ago. They would place a shop on hold, I would correct it, submit it, receive the message that it was submitted successfully, yet it stayed on my shops. Then I saw the first one disappear and show up on the job board again. Phone calls were answered by auto guy. I made copies of everything. Involved 5 phone shops. When they finally called me, I pitched a fit. I offered to send the evidence via email. They said it was not necessary and paid me for the shops.
Fortunately they have not had that problem in some time.
Do not read so much, look about you and think of what you see there.
Richard Feynman-- letter to Ashok Arora, 4 January 1967, published in Perfectly Reasonable Deviations from the Beaten Track (2005) p. 230