Customers are not stupid. They can control data integrity and accuracy, so let them tell you who they are - electronically. Most customers over the age of 7 can correctly type their name, address and telephone number. They also know their gender, date of birth and Social Security number. So, stop using handwritten data entry forms.
Computers are good proofreaders.
Hone in on the binary skills of a computer for error flagging and checking, and do it from the very beginning. Also, use rules where possible. Males, for example, don t often make appointments with obstetricians and women are unlikely consumers of Viagra. Computers can do a great job making sure data is correct. If the customer calls and finds that service agents have gone home for the day, that customer is inconvenienced.