Communications group Adept Telecom has won a three-year contract extension worth about £2.2m from its largest customer.The group, which provides fixed line, mobile and data telecommunications, said it was the third time that the unidentified client had renewed their contract, extending the pair's relationship to nine years.Chief executive Ian Fishwick said: "Our largest customer has over 400 sites across the UK and this renewal is great testament to the fantastic level of service we offer."Shares rose 5.5p or 4.8% to 121p at 16:06 in London.