Pathetic service costs me my dream house

The unprofessional, lazy, pathetic and careless service I received from my private banker has cost me and my wife our dream house. After having an offer on a house, which was very popular, accepted my wife and I, both private clients of Investec for many years app**** for a bond. When applying for the bond on the house we submitted all required documentation for the bank's consideration as soon as we could. Time was of the essence as the house had other offers on it, however as our financial position was by far the strongest and we were the only couple with access to a private bank, we were the clear favourites to get the bond approval first as confirmed by the estate agent and owner of the house. However it took Investec 5 whole days to grant us final bond approval whereas the eventual buyer of the house got his approval from Nedbank within 6 hours. When applying I clearly instructed my private banker that we were in a race against time. But neither she nor her assistant could be bothered by my needs. Emails and calls were blatantly ignored. I had to plead with the lady operating the switchboard to get a call back. When I finally got a response it was a bunch of pathetic excuses on why we had not received approval yet. She had no idea what was going on. Even when I clearly stated that my wife and I had double the gross income required for approval, she still could not provide feedback. Then after 3 days already, we were informed that the property needed to undergo a valuation. I immediately arranged with the estate agent to arrange access for the valuator to value the house, but no valuator was ever arranged. After two more days of calls and emails being ignored, paired with pathetic excuses for non-delivery we were told that a quick desktop valuation was all that was needed. Another 2 days wasted which ended up being the fatal blow in our quest for the house as our final approval came in a few hours too late. My private banker just couldn't be bothered with my need for timeous approval and offered excuse after excuse without any results or solutions. It seems that there is zero communication between departments at Investec as nobody had a clue what was going on. With the cost of banking at Investec and their continous boasting of being the best, I was shocked at their poor level of service and their pathetic and rude feedback on basic queries. They left me disappointed and frustrated beyond belief.