According to our communication with your colleagues, you should know we have confirmed and accepted finalizing  the project  successfully.  We all know there were some problematic issues in duration of this whole process and we want to thank you and your experienced, organized and competent staff for the support and involvement during the whole cycle. Despite the challenges we faced during the process, your involvement and responsibility were instrumental in achieving this success. We officially confirm the successful completion of the project, overcoming all difficulties. For other issues, we will try to deal ourselves and in case of any problems, hope for your future support recommendations.
Your understanding, effective communication, and level of responsibility was essential during the whole process. Looking ahead, we hope for continued collaboration between our teams.