I've never bothered with the phonecall/letter/visit routine
Some of my previous employers have been a bit tardy with things like holiday pay, P45s, references etc. They get one phone call, and if they do the out of office/we'll call back later/he's on holiday, they get a fax at 0800 the following morning. The fax takes the same format: A small claims case will started or HMRC will be informed, and they have 5 working days to comply. No correspondence will be entered into, and phones calls will be politely refused.

Wins currently standing at 4 out of 4. Quickest response was a courier in 90 minutes with my P45.
(all my scars face forward possesses 2.5% of a hyperalloy combat chassis, Fri 3 Sep 2010, 12:57, Reply)