1-800-Say What

If you dial 1-800-GOT-JUNK,  you expect to reach your party by dialing the standard number of digits, right?  10 + the 1.   But if you call Time Warner, the number for Customer Service is
 "Call us anytime at 1-866-321-CABLE"    It seems that you can get through that way, most of the time, but might we not expect something a little more logical and efficient from a communications company?  An extra digit is not all that insurmountable, just seems rather foolish.  After all, it's not dial 1-800-JUNKY.