Just returned from Cumberland Farms. Paid $30 for gas; gave a $100 bill; received back $70. Pump stopped at $10; went inside and said I should be getting $20 more of gasoline. Clerk said she could only give $10; as the paper said $20. $10 was stolen from me. It was a new clerk; she must have punched incorrect numbers. I feel I should get back my $10. Actually I had to give her another $10 to get my $30 worth of gas that cost me $40.