Firstly, I'd recomend trying the dealer explaining on the phone your problem and see what satisfaction he can offer.If this fails you could try a repair.
Aside from the annoyance of feeling the damaged core on every cast, you run the risk of the core absorbing water, which will make the line sink and perform oddly. The best method for repairing a fly-line coating depends on the severity of the injury.
In The Orvis Guide to Tackle Care and Repair, it recommends using adhesive to bond the exposed ends of the coating together and to the (undamaged) core. This is ultimately a temporary fix because the adhesive will eventually buckle, crack, or fail because of the constant bending and stretching that a fly line undergoes. However, if you only have to perform this operation a few times a year, it might be worth it.
Repairing Fly Line Coating
One simple way to repair a nicked fly line is to bend the line and apply Aquaseal® or a cyanoacrylate (CA) glue to the crack.
Aquaseal®, gel-type superglue, and flexible CA glues such as Loctite® 414 and Flex-Zap have been used with good results. The key is to ensure that you apply the adhesively evenly and completely.
Finally, it sounds as if you have a few probable causes of damage. Cracking of the line tends to occur when the oils in the plastic have dried out. It almost always occurs on the front 10-20 foot of the most hard working part of the line. The application of strong detergent cleaners can cause this sort of damage. I'm not in a position to comment further about how your treatment of the line may have contributed to its damage.


BK