If you want to close your Xolo Go account, then all you have to do is inform us about your wish by writing an e-mail to firstname.lastname@example.org.
The partnership will be liquidated by Xolo acting as the sole liquidator of the partnership. Thus, it does not require significant administration from your side.
Before the final dissolution of the partnership, obligations (e.g. agreed project delivered, partnership profits distributed) of both parties in the partnership -- you and Xolo -- need to be settled.