It has already taken delivery of 257 new Vauxhall Astra and Vectra models and another 40 vehicles will be delivered over the next few weeks.
The company has a sole supply arrangement with ING Car Lease for all renewals. All the vehicles are on contract hire and the service package includes accident management.
Berkshire-based DVC Sales provides a full range of services to companies such as Nestle, Vodafone and Britvic. The cars will be used to visit clients nationwide to provide account management services.
Peter Handscomb, DVC financial director, said: 'ING Car Lease was able to demonstrate a professional and proactive approach, not only in its quick response to the brief, but also in its excellent service levels.'
ING Car Lease managing director Ian Tilbrook added: 'This contract represents a significant opportunity for us to continue to forge ahead with our growth plans within the UK market.'