My remap nightmare

[Hawki341]

So had a remap a few weeks ago in Cardiff, few friends have had one there and had no problems at all. Had it done, felt hardly any difference. It's a 2012 2.0 Cdti.
Put my foot down in 6th, straight into limp mode because of overboost. Guy said he had adapted an insignia map to suit it. Took it back and they changed it, no more limp mode but still hardly a difference, and poor fuel consumption.
Took it do a dyno, got figures of 167 bhp and 390nm. Torque has improved a little but hardly any bhp, 160 standard.
Now they are saying it's probably a turbo problem. I don't think it is tbh, any one had problems with remaps on this car? Or any suggestions what it could be? Thanks

You had it remapped but only gained 2bhp from stock? Seems dodgy that bud least gains usually around 25

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