Do I have authority to change my wife's CNA LTC Policy. I don't have any document that would give me that authority. I am 87, wife is 78.

We received notice of almost doubling our premiums for the years 2019, 2020, and 2021. In order to avid the increases we were told we can remove the 5% annual increase in benefits which I did for both of us. It turns out the CNA company made a mistake in keeping the same premiums as what we paid in 2018 and are increasing premium charges for those years although not as high as if we kept the 5% annual increase in benefits. My wife found about the change I made for her policy and said I did not have that authority for her policy. The CNA company in writing said that a change like that can not be reversed. The first premium payment under our policies without the 5% annual benefit increase is by December 31,2019. My question is if I contact CNA and ask to reverse the decision I made for my wife's policy arguing I did not have that authority is it possible they would agree. The signature for my policy change and my wife's is the same. Can I contact a lawyer to agree I had no authority?