That's ok about the screenshot. It's likely the reps on this site can check what transpired anyway.
Basing a judgement on one person and one experience is still uncalled for, no matter how many years of experience in CS you have. Calling out the particular agent is reasonable, and bringing the matter to the representatives of the company is also reasonable, but judging an entire group of people based on one single sample is illogical. Erika may have issues, but John or Veronica or James or Priscilla or others may be great CS reps, and they do not deserve to be judged negatively based on Erika's behaviour. Focus specifically on Erika but don't water down your argument by passing broad judgements on the whole company and the whole CS staff.
"Plus, like I said, I had not even had their service for a full 24 hours yet and stated that in my opening comment."
Exactly. And yet you made a broad judgement over everyone involved with a company you hadn't known much about only 24 hours ago.