Oh give the guy a break! Arrows on cables indicate that they are directional. The manufacturers presumably believe this "works", otherwise they wouldn't bother. Even my QED Qunex 1 interconnects had directional arrows on them, and at £20 each or something, you could hardly claim that this was a high end piece of kit which was sexed-up by the manufacturer to try to screw a few more quid out of gullible punters. It's just a reasonably well-made, decent, budget piece of kit. The manufacturer has nothing to gain by sticking a couple of arrows on it. Ok, nothing to lose either, but I wouldn't say directionality on cables is a particular selling point.
To the original poster; if I were you I'd take your cable back to the dealer and ask if they'd sort out the terminations. Any dealer worth their salt will be happy to oblige a customer who's spent that much on cabling, and it'll give you piece of mind so that you can stop wondering and just start enjoying your music.