Canwest Propane

I purchase propane in bulk for my recreational property in Windermere BC and pay a tank rental. The tank has a 1997 date and a level indicator which is stuck at the 85% full level. The pressure relief valve has not been maintained for at least the last 10 years. When I reported the stuck level indicator to customer service I was told to tap the gauge This is a company that has poor customer service, which is frightening when dealing with a flammable product like propane