Hi Sofia Zgouri,
Thank you for contacting Microsoft Advertising Support! I understand your account is automatically adding funds from your debit card. Don’t worry I’m here to help!
It sounds like you have auto-recharge enabled on your account. Auto-recharge ensures your prepaid account is always funded by automatically charging your primary payment method once your account balance reaches 20% of the recharge amount.
For more information on how to turn off this feature, please click here. You also stated that you deleted your campaigns and you were unsure how to deactivate your account. For more information on how to deactivate your account, please click here.
I hope this helps!
Sincerely,