I've run call centres like this and you need to assume massive staff turnover. Places that pay well, £10+ per hour plus have staff problems, at £6.50 you are going to get rubbish.
When I can the centre recruitment worked like this:
Advise jobs every day, everywhere you can afford.
Everyone who applies is offered an interview - regardless of skills, background, etc.
(We had around 120 applicants per week)
Most people will not turn up for the interview.
Everyone who turns up for an interview is offered a job - everyone
Most of these people will not turn up for the job
Sit down with new staff for 1 hour, going through the script, then they start work
After a 2 hours give them a break
About 1/3 won't come back from the break
Of those remaining, about 1/3 won't come back the next day.
Second day more training, more people leaving and so on.
You can invest as much time and effort in training at the start as you want, it won't affect staff turnover. Once they start calling people and are sworn at, threatened, etc they will start leaving.
By the end of the week, you'll be lucky to have 2 people remaining - one of those won't have made any sales and you'll have to let them go. The other one will last anything from a few weeks to a few months.
Cold calling you'll do well get 1 lead in 100 calls. If someone averages this they'll be a superstar.
We maintained an average of 22 staff, but hired around 150 having offered jobs to many many more.
When I had been there for 1 year, everybody else at the company from the sales director to the reception had been replaced at least once.