Unfortunately the only way to resolve this issue is visit the customers property to clarify what fiber the pile is made from. Looks to me like sisal, which if wet cleaned, I would suggest the cleaning method used was incorrect.
Out of curiosity, when a job comes in , do you visit the property first, do the inspection, quote and write out a job sheet for the employee whom will be completing the work? Or does your employee go out, quote for the job and if price is acceptable complete the work there and then?
Adam