A Quandary (Interactable Lorepost)

I find myself in need of advice, particularly as it relates to infernal contracts. I made an arrangement with a certain archdevil of a memories to acquire and then transfer services of a pit fiend by gaining ownership of her soul. In exchange, said archdevil mentioned he *may* be able to help me know inerrantly where and when I am and start to develop a persistent identity.

The need for this is simple. I have been chronothaumically linked to a blue box which travels in time and space. It operates at the whims of an immortal shapechanger and drags me along with wherever it goes. The spontaneous involuntary movement hundreds or thousands of years away from my present location is colossally detrimental to my ability to develop an identity and people or things I care about.

I won't bore or offend you by explaining to you precisely how I managed to get the pit fiend to pledge herself to me. I am likely the preeminent master of the usage of magical wands of Charm (female-presenting) Humanoid. She presented as a female humanoid, to her immense enjoyment, which led to an enthusiastic overflow of gratitude.

Involved in the pact wherein she pledged herself to me was a sort of awareness of the distance in space and time between myself and her and the ability to contact her regarding her present location in space and time. She knows where and when she is, and from there I can determine where and when I am.

The reason I have made this post, however, is I find myself with questions three:

1) The contract specified that Ith'Raal would provide assistance upon delivery along with a variety of limitations on how the transaction would occur. It was remarkably vague on the subject of requiring completion of the contract once things were acquired.

2) Seeing as I have everything I would have wanted from completing the contract, is there a means of voiding the contract as "no longer interested in completing the transaction"

3) Is there anything else I should attempt before I actually start the work of acquiring and developing my identity and figuring out how to unlink myself from the blue box?