Dirty Oil After Oil Change

I went to the dealer to have my oil changed but after the oil change the oil color on the dipstick was brown, not the usual honey or clear color I used to see on my previous vehicles' dipsticks following an oil change. I suspect the dealer did not change the oil because they either forgot in the midst of their busyness, or they simply forgot to do it. The dealer swears that the oil was changed, but I've never heard of a car's oil color being tan to brown in color following an oil change (assuming the filter was changed, as it was supposed to have been). Please let me know if I am being paranoid or if this does happen in Volvos or other cars. Thanks in advance!