There are several things you can try.
First, do a complete backup of your iphone. This can be used in case you end of erasing your iphone, you can then simply restore it.
You can try creating a new Apple ID and associating the phone to that new ID and disassociating it from the old Apple ID. In addition, you can go to the icloud.com site and log in with your old ID and remove the iphone from the list of tracked devices.
You can also call the Apple help line and explain your dilemma to them. They may be able to help you out here.