No-one likes being contacted out of the blue. Unrecognized numbers usually mean the bank, scammer, sales calls, or in this case, creepy cashiers who stole your number from the store’s system. Aside from this being an epic invasion of privacy, which he does admit later on), how did he think this would end well?
Good for Rachel, though, who stood up for herself, and obviously contacted his boss to get this guy fired. Turns out she is “really cool,” and far too good for someone like him. Hopefully, he learned his lesson and will keep privacy in mind in the future.