Problem with warranty - need immediate assistance

Hello, I purchased a Dell Inspiron laptop in October of last year. (It should still be under warranty for at least a week or two) Recently, the laptop has devoloped a few issues and I would like to send it in to be repaired before the warranty ends. 

In the past year I had issues with my laptop. I had to call in twice and was twice given refurbished laptops as it would have been a long time to repair. I was given a new service tag at least once.

The problem is my current service tag is not recognized by Dell as it was never properly transferred for whatever reason. I have spent over 3 hours on the phone the last several days without any luck in resolving this issue. The service tag I have now is not recognized by the Dell website and one of the older ones is recognized but comes up with "Issue with Warranty". I assume it's because it was never properly transferred. The models of the laptops I received are also slightly different so that could be an issue.

I would greatly appreciate if a Dell representative could help me resolve this so I can have my laptop repaired before the warranty lapses - This has been a very frustating experiece. Thank you.