All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
If you had borrowed money with Riba (interest and/or usury) while not knowing the Sharee'ah ruling of that and you were not negligent in failing to ask about it, then you are excused and you are not sinful, Allaah willing, as Allaah Says (what means): {So whoever has received an admonition from his Lord and desists may have what is past, and his affair rests with Allaah.}[Quran 2:275]
As regards the property which you bought with this Riba-base loan, then it is your property and it is permissible for you to benefit from it like all other property that you have, and you are only obligated to pay the original debt amount to the bank without any interest. Concerning interests, it is not permissible for you to pay it unless you are obliged to do so as we clarified in Fataawa 84434 and 81346.
However, it is not acceptable to donate in charity the original debt since the bank still exists, rather you may send them the money in a way that you will not be harmed.
Allaah Knows best.