I want to change my tariff

I just bought a new o2 SIM and it came with o2 loop tariff, containing data, call minutes and sms worth a total of 9.99 Eur, to last for 1 month.
The plan will expire tomorrow 23.6.19 and I want to change to the data plan of 200MB per month, non renewable automatically. I tried to order for the package but thereafter, I discovered I should have deposited my bank account details before doing that.
Right now, the o2 loop account is still active; the new order I requested is till on, waiting to deduct the money if I deposit my bank account details.
I want to deactivate both accounts and start afresh so that I don't get debited by both pending requests at once.
Please how do I achieve that?
Because of this development, I have not deposited my bank account information yet, until I handle the issue.
Somebody please help me out.
Thank you.