Eight completed credit agreements were disposed of in the skip. They contained customers' personal and financial data, and were found by the local authority's environmental health department.
The Information Commissioner's Office investigated the case and found that the documents had not only been kept for longer than is recommended, but had not been disposed of in an appropriate method.
Documents of a sensitive nature are meant to be transported to a central location in sealed containers and then shredded securely.
DSG's chief executive, John Browett, has now signed a formal undertaking, binding the company to taking a number of steps to ensure such a failure does not happen again. This includes reviewing security procedures and providing staff training.
Mick Gorrill, head of enforcement at the ICO, said: "Any organisation collecting and holding personal information needs to ensure that information is kept and disposed of safely and securely.
"Staff need to be aware of policies and it is essential they receive appropriate training to follow them."
DSG had not responded to a request for a comment at the time of publication.
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