There might be two reasons for the issue:
1) The sequncing results report might be mismatch with the sample.
2) If the sequencing result does come from matched sample but you doubt the reliability, we would re-sequence the samples. The plasmid would isolate from your original cell culture and submitt for re-sequencing. If the sequencing result is different from the previous result, we will waive the cost for the re-sequencing; if it is still the same, we will charge extra sequencing fee.