I must Pay Glasfit to replace the glass they smashed without permission....

Glasfit Knysna was called to Star Panel Beaters to remove the windscreen on my vehicle so they could respray the roof. Glasfit failed to inform their client that the windscreen had a chip and thus had a higher risk than normal of cracking. They then damaged the glass while removing it, I had to claim for a new windscreen from my insurance as neither of them take responsibility for damaged glass that they have worked on. my insurance accepted the claim and authorized Glasfit to carry out the repair. I was then informed by Glasfit theat I had to pay them R900 excess as well. I believe this all shows a lack of ethics and integrity. I have asked Glasfit for a discount as a gesture of goodwill at least but they refused. I told them that I would have to share my experience with my friends and possibly social media but that I would only state the facts as they happened. The lady then phoned me back a bit later to threaten me with legal action if I proceeded with this. It has been a stressful and upsetting experience. They employ ************ tactics with the public, it is especially worrying because I had no idea these people were going to work on my vehicle without my authorization.