Have i been scammed?!

Had a collection yesterday from DPD setup for my dyson fan.

Was collected at 9:30am thought that was it, happy days.

Then 4pm another DPD driver came and tried to collect, i advised this had been collected they marked as rejected and left.

I suddenly had a bad feeling as i couldnt check anywhere that the machine was taken at 9:30am, who has taken the machine?

CS have been useless on both chat and calls.

Please help, was this a fake collection and its been stolen?

HELP

Thanks