Thyrocare — false blood report

I have done blood test of thyrocare with package arogyam 1.5 on 9 feb 2018. And on the reports it shows that my average blood glucose is 123 mg/dl and hba1c is 5.9 that means i am diabetic. Next i took my fasting blood sugar and postprandial blood test on 11 feb 2018 but this time from other lab. To my utter shock my fasting blood sugar is 80 mg/dl and postprandial is 70 mg/dl. That means i am not diabetic. I am shock how can my blood glucose level change so fast.
I have wasted my money. Never expected this from thyrocare.