Alamo Car Rental Charged for extra that I didn't request Internet

This is a copy of my recent email to Alamo regarding my being charged for their Roadside Plus.

Sirs
 
I have been a frequent and loyal customer of Alamo; most recently as stated below.
 
It is with a certain degree of regret therefore that I now need to write my very first ever letter of complaint. Details as follows:
 
When I arrived at the Alamo Rental Counter at Orlando International Airport on the 2/23/2012 at 6:50pm, I handed a copy of my Booking Confirmation (as below) to the counter clerk. After providing him with the other items requested, he asked me if I was interested in upgrading to a larger vehicle. I informed him that I did not wish to do so. He then handed to me a copy of the relevant documentation where he had placed an 'X' in the places that he stated required my initials and signature.
 
As I had not been offered any other additional options, and neither did I request any additional items, I was dismayed and annoyed to see upon my return of the vehicle that I had been billed an additional $179.64 (plus tax) for 'Roadside Plus'.
 
At no time had I requested 'Roadside Plus' and if it was an item, that I had been instructed by the counter clerk to initial , then I did so under misrepresentation by your counter clerk.
 
I therefore request that you conduct your own internal investigation and refund me the over-charged sum at the earliest possible date.
 
Thanking you in advance for your prompt attention.
 
Sincerely
 
Geoff G