Home structure insurance bad service and failure to properly handle claims

i submitted a claim about two years ago with nedbank home loan insurance for my gate motor that was ******.nedbank send someone out to my home to have it replace . I was at my house on the day the motor was replace and i told the service provider that the motor that was ****** was an maroon ET gate motor ,strong enough for heavy traffic. I told the service provider that nedbank provided that the ****** motor was maroon et motor but they insisted that the new drive 500 Blue in colour is the same motor .i believed him and sign a paper of which he said its for the work that has been done . i later found problems with this motor blue in color drive 500 motor from the time it has been installed until it got worse ,of which i logged a call with insurance for this motor .the insurance send me the details of the service provider and he contact me .In our telephonic conversation i told him what happen about the service provided that installed a drive 500 motor of which he told me that it is the wrong motor it should be a drive 600 motor . on my surprise when the service provider met me in front of my house for the recent problem i log with nedbank ,i notice it was the same person .he open up the box and told me there is nothing wrong with the motor and told me that the battery i must replace because the lifespan on a battery is about 1 and half years. My problem with the gate motor is not fixed it does not worked during odd time and malfunction on some occasions .It is a danger to me and my family and make my property easy to excess for theft and all types of crime . My previous Maroon et motor never done that and that i never replace my battery for a long period of time .My father in law has a maroon Et motor for more than 5 years and still the battery was never replace . I spoke to two gate motor technicians and they both told me that 1 and half year span of battery is nonsense and that the service provider must replace the motor with the maroon Et motor because the company that manufacture the Et motor still have the maroon Et motor in stock and still in production. My solution to this problem is that nedbank must send out other service provider and replace my motor with the matroon ET motor ,the original motor and that they had to send a different service provider. I informed nedbank of everything but they insisted that the service provider spoke to my wife. My wife never spoke to service providers over the colour of the motor. That was a easy story to make up. I have endless problems with this gate motor becuase it's to weak to pull my gate..i told nedbank representative that the service provider told lies but they refuse to investigate this matter. I came to the conclusion that I know have suspicion that nedbank send their own service providers out so that they don't have to pay a claims. I'm deeply disappointed