England will make an official complaint over a controversial umpiring decision on the second day of the fourth cricket Test against South Africa in Johannesburg.
Third umpire Daryl Harper allegedly failed to turn up the speaker volume when England referred a caught behind appeal against Graeme Smith.
A noise was clearly audible on replays but Harper said he could not hear it.
Smith went on to make 105 as South Africa closed on 215 for 2, a lead of 35 in a match they have to win to level the series and retain the Basil D'Oliveira trophy.
The wicketkeeper, slips cordon and the bowler all appealed in unison, but on-field umpire, the New Zealander Tony Hill remained unmoved, prompting England to refer the decision to Harper.
Although a noise was clearly heard on television replays, the Australian official said he could not hear anything decisive and concurred with Hills's original not out decision, sparking dismay among England's players.
Following the incident, an official investigation was conducted in conjunction with Sri Lankan match referee Roshan Mahanama, when it was discovered that Harper had his speaker turned up to level four out of 10.
