eFax Hell?

RH Wesson asks: "We use eFax to distribute a 3 page fax once a week to about 75 customers of ours. Yesterday we uploaded a postscript version of our 3 page fax instead of the usual PDF version using the eFax Manager on Windows. We started getting calls from our customers about a 300+ page fax of garbage (it was really postscript source) We spent hours with eFax requesting them to stop the sending of the garbage. eFax was never able to stop it, in fact we spent hours trying to determine if the fax was even in their queue. In short we lost a lot of business that day and managed to piss off ALL of our customers at once. We are going back to using a regular fax machine. Has anyone else had a situation where the danger of technology loosing you business outweigh the efficiencies gained?"