Still waiting for my clearence for my new motor

Van sat for four months for an overheating issue after countless mistakes by Nissan and their suppliers a new base engine was to be fitted. Van was ready in March after it was towed to Nissan Ballito in December. Today is now 26th of June and the clearance for the van still isn't done. Van is used daily for business and is a 2019 model. The runaround given by Nissan a supposed big dealer is shocking their service is terrible