Unable to rent a car from thrifty website

I have been trying to rent a car from thrifty website for 4 Dec / 5 Dec from CPT Airport Error keeps on coming up I called the number from the website , a person by the name of Imaad answered when he tries to book from his side , rental fee is much higher than the website I tried booking online from different devices , different days - still error pops up Imaad cant give me another customer service number Imaad cant give me email address to contact Imaad says number on thrifty website is for HERTZ Thrifty management should fix this error and improve their customer service Can some one please call me with a solution or book a car for me THank you