The Internet Group was awarded the accreditation for demonstrating a high level of customer support via its IT helpdesk.
The firm, which claims to be the smallest company in the world to receive the accolade, was praised by the SDI following its assessment period for its “open and direct communication with clients".
Other companies to receive the SDI’s three-star accreditation include O2, Sodexho and Phase Forward.
Mitchell Feldman, sales and marketing director at The Internet Group, said the company hopes to be awarded SDI’s top-level, four-star accreditation next time.
“We have made a number of changes in the past year and a half, which have helped us provide a higher level of service and achieve the three-star accreditation,” Feldman said.
"With these improvements starting to bear fruit and more plans for the future, we can punch above our weight with ease and are confident of an even higher score in the next audit.”
Howard Kendall, chairman and founder of the SDI, added: "The Internet Group has used the SDI's globally recognised Service Desk Standards to ensure their customers are given the best possible service and to demonstrate that they are truly dedicated to best practice."
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