Stuart Mitchell (pictured), CEO of Mitchell & Partners, said: "It's a great shame that we had to make this move. The telecommunications sector will be highly competitive in the period ahead and this decision was unavoidable. Hutchison has been a fantastic client over the years."
Recently agencies in Australia had expressed concerns on the reports of Mitchell winning Hutchinson as it handles Optus in the country.
Hutchison Telecoms is a listed company which has a 50 per cent interest in Vodafone Hutchison Australia (VHA). In 2003, Hutchison introduced Australia's first 3G network.
In June this year, Hutchison and Vodafone merged their telecommunications business (3 and Vodafone Australia) in a 50-50 joint venture called Vodafone Hutchison Australia (VHA).