I had a very sad experience with Wanadoo (Orange) about a year ago. I made several (10+) calls to their helpdesk(s) and even with my limited knowledge it was clear their technical training was limited.
The issue? I moved house and no BB even though I had solid lights telling me my line was enabled. The reason, Wanadoo exact a charge for house moves and they said it would be taken along with my monthly payment at the end of the month. Fine.
Except, because they had not taken the money ( it was due in 3 weeks) I was tagged as a bad payer and my service was terminated, not just once but three times.
Needless to say I moved to another ISP who's helpdesk can only be described as excellent.