No call back from billing

Can rain please fix their incorrect billing amount so that i can pay. My payment due is 659 and not 1113. I only missed February payment on 25th.i wanted to settle that but was shocked when i saw the billing amount. I already called support twice and they also confirmed the same thing that what is due is 569 however only billing can amend this amount. I waited the whole day for billing to call back. Can you please fix this and bill me the correct amount so i can pay. Thank you