The appointment is a return of the account to Oomph, which had previously handled the media buying and planning on selected product lines.
It was only reported earlier this week that i-level had parted company with CFS, part of the Co-operative Group, and includes brands such as the Co-operative Insurance Society, the Co-operative Bank, and internet bank Smile. I-Level had handled online activity for CFS for the past eight years.
Sean Barton, e-business manager at CFS, said: "Oomph have a history of doing extremely effective work with us, they have a great media offer and consistently show an understanding of the complexities of online media planning and buying that should make our lives simpler and our business better."
Oomph will focus its activity on all areas of the CFS business, with the remit of growing customer numbers using display, affiliate and aggregator activities as cost effectively as possible.
Stephen Priestnall, CEO and planning partner at Oomph, said: "Matching innovation in media planning with effectiveness in building business from smart buying is what we want to do. We know CFS has the brands and products to make that strategy successful and we're looking forward to getting on with it."