1. You can dispute to get it to show as paid. Best case they don't respond and it gets deleted. Likely case they update to the correct information.
2. You can try GW letter to ask them to delete all together (see example letters on this board)
3. You are getting close to the end of the 7 years, it's probably not actually affecting your score much. It will fall off soon anyway if the above methods don't work.