Service not done properly

I do have a problem with Tavcor George Branch.I took my spouse Polo Comfortline for a service there.The service was done and 3000km there were absolutely no water in the battery.A service inspection were also done with this service.I did ask for video footage of the specific service and their manager told me they are keeping this material for 15 days.He also told me that I must take the vehicle to JP Motor Spares in George to check the battery because it is not a factory fitted maintenance free battery.This was done right after his call.They did not found any fault with the battery.JP told us that the battery life is shortened by running dry.The problem is that they cannot proof that water levels were check with this service.It makes a person wonder if the other points on the service inspection were done.Problem is that iI will have to replace a battery because a service technician did not do what he were supposed to do.Unacceptable.