Wells Fargo Credit Card Complaint

Wells Fargo Credit card department,

APR or interest rate Texas

to whom it may concern : I got a line of credit loan from Wells Fargo. I was paying prime plus - for several years. All of a sudden the jumped up to prime plus 8 % for no reason. I need help with this. I do not feel this is fair. I called to see if they disclosed to me the min and max amount. They said they do not provide anything in writing. They only do this verbally. - - - - -