Thank you letter question.?

I had 4 interviews last week and the HR told me that they're gonna do a background check and it will take a couple of days. I did call the HR yesterday and she told me that they start doing the background check maybe next week bec. they still have 1 applicant . From there they will make a desicion. She ured me that she will call me back whether i get the job or not. Now im confused bec. i just received a thank you letter from them saying that they are currently reviewing all applicants; if there is an interest the manager will call you to sched an interview. Im not sure if this is their response to my resume which i submitted online. I went straight to the company day after i sent my resume online. I just walked in for an interview. Im not sure if this is their response to my application online or is my application turn down. Is there any possible way that a company will not consider your application after the HR disscussed the job responsibilities,salary etc.?thank you so much.I tried to call them today but no ones answering the phone.