Do you think the company just happened to be extremely unlucky and only hired dishonest employees?
If your company is at a stage where your support employees are only working 2 hours a day, and where a customer cannot get support for what they need in less that 10 days, it's an issue with the management and the organisation, unable to provide motivation to their employees, or the condition they need to work effectively, it's not bad luck with hiring.
And thinking that just firing those people is going to solve the issue is burying their head in the sand. Maybe the ones that didn't get fired will work a bit harder in the short term, driven by fear, but on the long term it can only get ever more demoralizing.