Hello.
I guess you are living somewhere along Old Tampines Road. SBS Transit operates service 29 at a headway of 15 minutes as the ridership would not be enough to cover the cost of operation if the headway is shorter. Most importantly is that low ridership with fast headways would only waste resources. Unless the demand for the service around your area increase or if there's any changes to the route of service 29, the 15 minute headway will be here to stay and no new services will be introduced. MPs for Changi Village area has urged bus companies to operate more buses to Changi Village, but even if so, they might not be passing through your area.
Perhaps you can feedback to SBS Transit at
SBS Transit feedback page, call them or write in to them.
Hope this will help.
Have a nice day.