I booked a reservation on Alamo with a rate of $187. The rates then dropped and I booked for $121

. Problem is when I try to cancel the 1st reservation on the website it says I can not modify or cancel without calling, in fact both reservations say this. I tried to call, but I get an offer to book a "free cruise" with no option to get to an operator.
I am an Alamo insider. Anyone have any insight about what is going on? Will there be any problem when we go to get the car as long as I have my printed reservation?
Thanks!