It can be many different reasons
The best thing to do is have their customer service or agent go over each bill and each payment made by you. I have to say that most carriers have electronic records and they are USUALLY right. You really need to go over each month together to find out what happened.
If they went to collections, then that means you went a long time without paying. They sent you bills and maybe made phone calls to you and you didn't pay or refused to pay. Who knows...but it is pretty late in the process when it gets to collections. Try to get the records from your old agent/company and back-track how it happened. Maybe your old agent could help you sort it out.
Hope this helps...
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