overall terrible service

I woke up on Monday to find my credit card overdrawn, while I was on the secure chat requesting details of how my account got overdrawn as every transaction I made was on a positive balance,my limit is only 1000, so I would transfer money from my cheque account to my credit if whatever I was purchasing was more than 1000, and every transaction with the exception of toll gates would immediately deduct as my available balance would decrease and I would get the notification email and sms of the purchase. By the way, the secure chat consultants are mostly useless to say the least, but while on that I get a call from a rude, condescending agent (Story for another day). When requesting assistance, to get details of 2 transactions with a description im not sure of and also because I got debited 3 times by Avis for the same car rental which im disputing so I therefore need the transactions list/statement to send to avis as proof, Lo and behold, Im nowhere near getting to the cause of me going to bed with a positive balance and waking up to an account that is grossly overdrawn. when every transaction was paid from a positive balance and no help at all regarding a transaction history for me to complete my avis dispute. really so annoying