***** car rental

i am trying to book a car, i went to the dbn airport yesterday, and they were unable to book a car in another province from there. In this day and age of technology! They gave me the number of the PE branch, who also could not help me telephonically! they said i should call the customer care line, which i had done earlier, and gave up after half and hour of holding on the line. I was then given a whatsapp line to message. This was responsive to my first message, but slowed down dramatically thereafter. Then i get an email confirming they have completed a credit check, I gave no permission for this, and now i must send my credit card details electronically. I called the call centre this morning and was told that they cannot check my reservation online to see if in fact a vehicle has been reserved, and then the call centre agent put the phone down on me. This is 2022. How do i just send my credit card details on email!