Horrible and Disgusting Service

I have ordered and paid for a part, ECU, for my LandCruiser 200 on the 24th of January. Since then I have been told various things, such as that the part has been discontinued and need to be manufactured specially for me . I was also informed that the part will take 60 - 90 days to arrive. 2 Months later, I am still trying to get an ETA on when the part will arrive, and this seems to be impossible to get. It sounds like they have not even started with manufacturing as I received a request at the end of March asking me to confirm the order to go ahead and to also inform me that the price "might"change. A part which I have been invoiced for and paid in January!!! Furthermore, after the dealership tried to rectify this issue at the workshop, I have received the vehicle back with almost all the lights on on the displays, messages like "Check VSC system"and "Check PCS System", the seat heater light and handbreak light, slip control, etc is permanently on. In an email to customer care as well as where I have cc'ed the dealer to tell them to urgently contact me and make arrangement to correct this, I have still not received a call, this is now more than a week later. The vehicle also has a terrible jerk whilst driving and feels like it can break down any minute. So I am putting it on record that any further damage to the vehicle will be for Toyota's account as I have done more than my part now and still, months later is not closer to an answer.