I wouldn't be too confident about PC World recovering any data. I know a couple of people who tried and were told the data was too far gone. Thereafter when they got someone with a bit of knowledge to look at them they had more positive results.
Given they have already wasted your time, I'd pick them up and look at alternative options for recovery. Chances are in another week or so they will only tell you they can't help anyway.
Whatever you do, hope you manage to recover the data.
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