double transaction on my credit card

on the 22/01/2015 i made a booking for a car on the website. i put in my credit card details but for some or other reason there was an issue. I then phoned avis to see what was going on on their side. they could not pick up the booking and i was ensured that if they cant see it the booking was not made. I then phoned my bank to reverse the transaction which they did. Ok so now back in the website made a booking and it worked. I paid the bookiing with my card. but the booking was for my husband and when he collected the car he paid the deposit etc with his credit card. He got the deposit back and we thought everything was hunky dory. But no I received my credit card statement only to see 2 lines of collections by Avis. one for the booking which my bank reversed and you still took and one for the actual booking. So i phoned the bank they cant reverse it. I have just spent 11 mins with the call centre and then the call was cut. I cant spend another 11 minutes. So my frustration 4 calls to my bank and your call centre. still an unresolved issue. I am still R253 poorer . please healp