I have been covered under automobile insurance with the same company for years, i'm changing companies and i've already provided the declaration page to my new insurance company but they stated they need proof of coverage faxed to them. What else could I send 
They might be looking for evidence of insurance . This is a form provided by your new insurance company . They might be looking for the Insurance ID cards provided with your policy . They might be trying to be difficult , in which case your state insurance commissioner would be someone interested in your plight . 