No Way

I got a notice today that I owe some money to the tune of $10,000. I have never run up that much debt in my life, and now this collection agency says I owe this? I have no idea what to do about this. For one thing, I'm not going to pay it... as far as I'm concerned, I don't owe it. I think I'd remember if I owed some credit card 10 grand... not to mention, the highest limit I've ever had on a credit card is $500. Should I call the number and explain this to them (and thereby give them my phone number and get harrassed 24/7) Or, can I ignore it and maybe it'll go away? I think, no matter what I do, my "credit" will be trash from now on. Not that it's good now, but I do have a credit card now and I always pay it off every month. Does that stand for anything? What about my cable, telephone and internet bills that I pay faithfully every month, not to mention the rent on my apartment? I think, instead of doing nothing, I'm going to ask for some advice. I'll keep you posted on what advice I get. Oh happy day!