Voice and data supplier audit for cost reduction A £6.3m refundCopyright © 2014 Sumerian Europe Page 1 of 3 UK bank recovers £6.3 million overcharge for outsourced voice and data service thanks to Sumerian analytics. The challenge A leading retail bank with one of the largest IT environments in the UK was in the final contractual year of its outsourced voice and data service. As part of the original contract, the supplier had underwritten comm

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