On WHM's site under the "Guarantee" section: " And, of course, we guarantee to always adhere to your deadlines." I understand that human error is involved and any number of issues can arise, but the simple fact is that the stated guarantee was not met. Of course most customers will agree to give more time for a paper rather than simply asking immediately for a refund - they want the paper, otherwise they would not have parted with their money in the first place.
I don't know what the OP's situation was as far as how long after the original deadline the writer submitted the paper and whether any new deadline(s) given by the writer to the customer were followed, but I personally have used Writer Help Me and had similar issues to the OP. The paper I ordered was not submitted by the deadline, and the writer made two subsequent promises to have the paper done, first a few hours after the due time and second by the end of that night - neither deadline was met. I do not feel that WHM upheld their guarantee in this instance, and I was not even aware that asking for a refund was an option because from what I could see the FAQ on WHM's site says that the company does not offer refunds, only rewrites.
As for the plagiarism question, the "citations" used in the OP's paper sound similar to the ones I encountered in the paper I purchased. More than half of the paper was directly copied from sources I provided without the use of quotation marks and proper parenthetical citation or footnotes. The writer simply put the reference author's name in parenthesis with the page range of the entire article at the end of the paragraph as if that was as acceptable way to provide credit for using their words verbatim. This was not a problem for me because I never intended to submit the paper as my own work, but many educational institutions view improperly used quotations and citations as a form of plagiarism - hence the plagiarism comment. Perhaps the writer was simply not aware of proper MLA citation format, but I find it hard to believe that any writer employed by a company like this would not know that using direct quotes without quotations marks and proper parenthetical citation is a form of plagiarism.
Overall I was pleased with the paper because I intended to use it solely as an example, but I was not pleased with the service I received, and I did not feel that the product/service I received lived up to the so-called "guarantees" on WHM's site. It seems that the OP might have experienced similar issues, so I was simply commiserating.
WB,
I'm certainly not a competitor of WHM - only a customer. I have used Writer Help Me twice, once as described above for a pretty substantial paper with which I was satisfied and once with a shorter paper with which I was unsatisfied. The latter paper was pretty much a summary of the Wikipedia page on the topic that I could have written better and for free, but at least the shorter paper was uploaded prior to the deadline and was properly cited.