The answer to your question will depend upon the terms of the contract you signed with the wedding planner. Since you do not have a copy, it sounds like your best option would be to first demand a copy from the planner you hired. The planner should not unreasonably (although many people are not reasonable) withhold it from you. Once you know the terms of the contract, then you can act accordingly.
*Please understand that this is not legal advice and please do not treat it is as such.*