I personally would not be encourage to refer a person based on a referral fee or discount on my next service. I refer people to a product or service based on how good the product or service is.

When i call for service I hate talking to a computer or playing musical
numbers with a phone tree. Try to give your customer some direct access.

If you have a problem admit it, do not try to blow smoke. I fought with
ATT for months over a DSL that would go out every time it rained. It
was never their problem. They blamed my OLD (14 year) house wiring.
It wasn't wired with the latest cat 3 /5 wire. I'm an engineer and knew
the wire had nothing to do with it going out when it rained. I rewired
my house because they said it did not meet there current standards.
Changing the wire made no difference. The problem was finally resolved when the rain only problem became an all the time problem. They found a broken cable more than a half mile from my house.

If you give a good honest service and do everything in your power to
please the customer the word will get around. Give bad service that
will also get around. If you make a mistake, admit it , do not try to blow smoke to cover it up. Just like politics, it isn't the mistake that gets you it's the cover up.