Terrible outcome for purchasing of vehicle at Volvo Hatfield

So this week we decided to trade in our current volvo and purchase a new one. We called Volvo Hatfield and they advised they had a vehicle we wanted. They sent us the application forms and we completed all info requested with supporting documents. For the entire week I was in constant contact with them back and forth with emails and phone calls finalizing the deal. Eventually we were advised by Finance lady that all done and we have to.come in Saturday morning to sign the papers. Then suddenly Friday afternoon 16h00 I recieved a phone call from the salesman that he has been forced to resign and someone else will be taking over my sale. Not thinking anything of it I then recieve a call from sales manager Darius who informs me that apparently they were not informed of my current vehicle being traded in and the contract cannot be signed due to non valuation been done to my vehicle....what a stuff up. Yet the day before I called the finance department and requested the trade in value and email with all the costs and breakdown of costs. Lady there advised me that according to her info my vehicle was being settled so actually they were aware of the fact that I was trading a vehicle in. They then requested I go to dealership 1st and once valuation done on my current vehicle they can carry on with the sale and purchase contract. They blamed the salesman originally assisting me but yet they are the ones that employed this salesman. So for a whole week I have wasted my time by sorting out paperwork and emails not to mention the hassle of cancelling current insurance and getting new insurance etc. Would not recommend anyone purchase a vehicle from this branch. Pathetic service