It may be there are no debts because it was taken out of the refund but I would double check that the first letter wasn't a scam.
A letter that represents a number is called a variable.
An unknown number represented by a letter or symbol is a variable.
It is called a variable
sum
variable
A number before a variable (letter) is called the coefficient of the variable. Both of them makes a term, or a monomial.
A letter used to represent a number is called a variable. Typically, the letters x and y are used, but technically you can use any letter of the alphabet.
It is a variable
A variable
a variable
a variable.
It is called a variable