By Levi Winchester Millions of broadband and mobile customers will be hit with bill rises of up to 8.8% in another cost of living blow for struggling households. It comes after the latest inflation data, which is used by many telecoms giants to decide mid-contract price rises, was released today. Under current rules, broadband and mobile companies are allowed to increase prices mid-contract in line with inflation, plus up to 3.9% extra on top of this. Most use Consumer Prices Index (CPI) inflation data for December, or Retail Prices Index (RPI) for January to decide their increases. CPI inflat…