Williams had been lined up by Kondor to join its non-specialist channel team, which has significantly increased its share of the non-traditional market in the past six months.
But Williams decided to stay at Dextra at the last minute.
Dextra managing director James Browning said: “I am delighted that Rachel has decided to stay at Dextra. Rachel’s decision to stay is further confirmation that Dextra is a great place to work and is a company that is really going places’
Williams has worked across the Phones 4U,Orange, Vodafone and Apple accounts during four years at Dextra.