"ANSWER THE BLOOD PHONE".
This. If companies keep me hanging on the phone with messages, music, beeps, "your call is important blah blah blah" then I quickly switch to doing business with other companies. I have very little patience for this shit nowadays. Especially so when the music is so loud you have to hold the phone away from your ear and when the call centre person in Mumbai finally answers they are barely audible and can't resolve your query anyway so put you back on hold again to find someone else, who also cannot resolve the query so transfer your call back to the UK again to speak to someone just up the road. Yes Barclays I'm thinking of you. Or rather I'm not, because I closed my account due to your appalling customer service.