The ASA found the ads were misleading as William Hill did not state that it would deduct the stakes from any wins that used the free cash. Punters also have to bet real money to access the £100.
In response William Hill denied the ads were misleading as punters were actually able to make £100-worth of bets.
The ASA said in its ruling: "Because the increments of free bets were only awarded as a result of minimum spends by the consumer; customers would expect those bets to be treated in the same way as any other bet and get their stake back with any winnings."
Despite the fact William Hill had laid out the terms of the offer on its website the ASA decided that as the bookmaker had failed to declare this on the press ads the campaign was misleading.
Recently William Hill launched a offering free bets of £5 or more as part of a scratchcard promotion to coincide with the beginning of the football season.
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