You have 10 days to cancel a timeshare, vacation or campground membership sold in Maryland, and to do so you must document the cancellation in writing and prove you sent it on time (mail be regular mail as well as certified mail return receipt requested, also send by email, etc.). Copy and save all your dated correspondence. If you have questions or complaints about vacation membership clubs, timeshares or campgrounds, call the Maryland Consumer Protection Division at 410-528-8662 or 1-888-743-0023. You may also file an online complaint at http://www.oag.state.md.us/Consumer/complaint.htm.
In addition to what my colleague stated, I'll remind you that if you do not take appropriate action to rescind the contract within the required 10 day time limit, you might find yourself being bound to the contract.
DISCLAIMER: Brandy A. Peeples is licensed to practice law in the State of Maryland. This answer is being provided for informational purposes only and the laws of your jurisdiction may differ. This answer based on general legal principles and is not intended for the purpose of providing specific legal advice or opinions. Under no circumstances does this answer constitute the establishment of an attorney-client relationship. For legal advice relating to your specific situation, I strongly urge you to consult with an attorney in your area. NO COMMUNICATIONS WITH ME ARE TO BE CONSTRUED AS ARISING FROM AN ATTORNEY-CLIENT RELATIONSHIP AND NO ATTORNEY-CLIENT RELATIONSHIP WILL BE ESTABLISHED WITH ME UNLESS I HAVE EXPRESSLY AGREED TO UNDERTAKE YOUR REPRESENTATION, WHICH INCLUDES THE EXECUTION OF A WRITTEN AGREEMENT OF RETAINER.