What will collection agency do for disputed charge?Please help

My alarm company sent me a bill for a service they told me was free. Now they sent it to a collection agency. I filed a complaint with BBB but the company hasn't posted their response yet. I sent a letter to the collection agency telling them I'm disputing this charge. However, I got another letter yesterday urging me to pay and notifying me the approaching 30 day limit(in 2 days). It seems they haven't received my letter. I just sent it by regular mail but I have a copy of it. What should I do now/ Should I pay for it first and wait for BBB? Or can I just ignore the collection agency because I'm disputing it? I just don't want to ruin my credit. If the BBB says we have to pay, then I will. Otherwise, I think it's not fair for them to charge me. Please share your opinion. Thanks for help.

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• Please share your experience or opinion. Thanks. -cielo- ♀ (0 bytes) () 05/16/2007 postreply 15:47:08

• my 2 cent -autumnmoon- ♀ (203 bytes) () 05/16/2007 postreply 20:40:32

• Thanks a lot. -cielo- ♀ (0 bytes) () 05/17/2007 postreply 13:54:33

• 回复：What will collection agency do for disputed charge?Please -basedonmyexperien- ♂ (1569 bytes) () 05/16/2007 postreply 22:59:50

• Thanks a lot.$120.Still with the alarm company because -cielo- ♀ (316 bytes) () 05/17/2007 postreply 08:59:38

• 回复：Thanks a lot.$120.Still with the alarm company because -basedonmyexperien- ♂ (677 bytes) () 05/17/2007 postreply 12:20:37

• Thanks for your advice. Appreciate it. -Cielo- ♀ (0 bytes) () 05/17/2007 postreply 13:55:09