Poor Service and aggressive attitude of the Manager/Owner

I had a frustrating conversation with Shane (he might be the owner or a manager) today regarding speakers that had been installed into a Reps vehicle 2 months ago as one of them has stopped working or blown. Not happy that the one has only lasted 2 months. Apparently speakers don't come with any warrantee and he blamed the wiring for the speaker blowing. I asked if they don't check the wiring and he said not. He was very aggressive and eventually told me to tell my driver to go and hung up. Very poor customer service on their behalf and I have asked our fleet manager to blacklist this company.