Bank sent my car to auction after i returned it to them

I have a big problem that has everyday been a nightmare. I am a staff nurse here in riyadh for almost 6years. My husband went exit already and i have no reason to still continue with the car we’ve purchsed from a bank as lease. I returned it last february they said that i need to wait until they will sell it in auction. I agreed because i have no idea about it since i am a female. I was with my father when i returned the car. And for the past weeks, ive been recieving messages from the ministry of justice saying that the bank will file a case against me if i ddnt pay the remaining amount from my contract, in which the bank personnel told me to just ignore because the system automatically detects that i am not paying anymore since february. By the way, it was them who instructed me not to pay the monthly payment of 1000sr because they said that i teturned the car already. And just yesterday, i went again to the bank and they are aaying that i need to pay almost 20 thousand riyals in cash without even showing me a paper of how much was the exact difference i need to pay after they sold the car. Secondly, they are not even showing the papers that they aold the car already. Please i need some help. Im goong crazy everyday about this. Thank u very much