As Bazza said put it in writing. With the chain, key words "risk to life" should be used. Mine supposedly had a PDI and a first service. Did it heck.
I went politely berserk, when they rang me to play the "Mrs Woman doesn't know what she is taking about" I calmly pointed out that these bikes don't come with airbags. If my car mechanic has an off day, I may have a crash, but if my bike mechanic has an off day I could be killed. "Apologies Mrs Marr we will give you a full refund".
I pointed out that I wasn't after a refund, I wanted my bike serviced by a professional t