The way you are handling the name looks reasonable. You have an array of pointers to char, you calloc just enough space to hold each name, and you return the pointer. But with the name you are dealing with data whose length you cannot predict.

But the length of a 4 digit integer is predictable. And you can store all 4 digits in one int. So you should have an array of ints. You should pass that array to your function. And your function should just store the int in the array.

Your line
int *refNumber[4];
worries me. That is an array with 4 elements. Each element is a pointer to int. You still have no place to store any ints.

Do you really have a need to split the digits up, one per element? If so I would use chars rather than ints.

If i and j are integers, you can copy one to the other with just
i=j;
you don't really want to do something like:
strcpy((char *) &i, (char *) &j, sizeof int);
that's crazy.

If you need more help with this, I would need to how you allocate the data which is passed to the function, and the actual call to the function. If you change the prototype, show the new prototype as well.