My account is visible to your third parties why???????

I just want to express my frustration with you guys you are not protecting your clients at all.

I shop around looking for a new car but affordable so i got one and wesbank came in approved but my issue is that i bank with fnb for my investments only and Capitec so because its my first time doing all this transactions i thought wesbank approved me because of my salary little did i know they went deep into my accounts and dealership calls me that i am approved i was happy yeeeey .

Then after signing for the car then wesbank sends me the statements of my loan owed to them ok - but am checking the accounts its not capitec its FNB i did not consent the dealership to use my FNB account nooooo but wesbank was able to do that whhhhy fnb why am i not protected ???? Now the loan amount is on fnb that i did not consent for.