It is printed on the back of the letter in type you need good light for.

Write nine lines.

Say you dispute it, say you want verification and an itemized statement of services with dates.

Send it certified with a return receipt, which cost me nine dollars and forty cents and which is the only reason I could prove anything.

And then get the itemization and go down it with a ruler, because every line has a date of service on it, and dates are the whole of the argument.

Thirty-five thousand one hundred and forty dollars of that bill was never mine and the only thing that established it was a date column and two hours on a Saturday.