I just got a Babolat PD+ from racquet depot and I ordered it with excell premium 16 (single set, no hybrid.) It arrived today with excell premium 17 and it is tied off in 4 places instead of the usual 2. Does this mean that they used two half-sets to string my racket. I would have bought from tennis warehouse but I had a discount coupon for racquet depot. Should I be able to get a full refund for this mistake? The shrinkwrap is still on the handle.