Let me preface that I'm not an attorney so I can't quote legal advice and I'm sure most attorneys will same the same thing so they are not sued. Moving on, The common window for Right of Rescission is typically 3 days with anything. This is the period of time you can withdrawl from the contract without penalty. Some companies off longer like the cell phone companies that allow 14-30 days. In your case, even if he did not go over the entire contract, as long as it's printed, your stuck. On the other hand, is there anything included about a breach of contract fee? This is similar to when you sign on with a utility for a year and cancel early. It's usually the equivilent of 1-3 payments. If not, you then could look at what method you are paying with. If it's being withdrawn from a checking account or debit card, simply file a dispute for non-authorized withdrawl with your bank and start there. Sometimes it works and sometimes not. If you're payment through your credit card, same thing, file a dispute. If that doesnt work, you could ask the bank to close that account and open new one and you have charges that the creditor will not stop.
Regarding the POA, it would specify what authority you are given to do for your husband while he is away.
If you already paid the lawyer a retainer fee I guarantee they will send a bill that covers that exact amount so any money you already paid is gone. If they agreed to a contingency fee and now are telling you this it is because they feel your case has a less than 99% chance of winning or being settled. They only take cases they feel they will win. If they are advising to go elsewhere then your case may be a dog. You may get the same answer from the next lawyer but its worth a try, don't tell them about the first lawyer.
I love lawyers. They say if you pay then it is a good case but if they pay and want paid back through your winnings it is suddenly a dog. Good ethical people.