can i ever get some help?!?!

I have been working with customer "service" over the phone for almost 2 months now to try to get my desktop to work. One day, it just wouldn't boot. It froze on the Windows screen. After a month and a half, Dell finally sent a tech out to give me a new hard drive. Now the operating system won't boot--it just freezes. The phone operators at Dell REPEATEDLY call me in the middle of the afternoon, despite the fact that I have told them at least 10-20 times over the phone and by email that I do not get home from work until after 6:30 central standard time. Yet every single time, I get a "sorry to have missed you" voicemail at 1:00 in the afternoon, or 5:30, or some other wierd time. I'm seriously ready to go crazy. This customer "service" is a joke. If anyone knows how to help me with this issue, PLEASE let me know!!!!!!