The Forgetting Sarah Marshall star quit his BBC Radio show under intense pressure in 2008 after he caused outrage by leaving a voicemail message for the Fawlty Towers star boasting about sleeping with his granddaughter Georgina Baillie.
In the fallout following the incident, Brand and British Tv presenter Jonathan Ross, who was also part of the prank, said sorry for upsetting Sachs, but he has now spoken out to blast their apology as a sham.
He tells The Times newspaper, "I don't think about it much. It was not a happy time... What they did was disgusting."
Asked if he accepts the pair's apology as sincere, he replies, "No. It doesn't mean a bl**dy thing."
Sachs' wife Melody also slammed Ross and Brand for continuing to refer to the incident during Tv chats ever since, adding, "They never leave us alone. I only wish they'd stop now but they keep using it and using it. I mean, they've earned enough out of it, surely?"