Simple task cannot be done

I cannot spend all Saturday on the phone, dialing and re-dialing your customer service number and clicking through the menu. All I want to do is recalculate my monthly payment, I paid in a lump sum. I get pushed from pillar to post then get cut off. You have my ID number in the relevant section. Please just recalculate my monthly payment and stop wasting my cellphone funds. I made the calss from 11:45 to 12:00 please check your records to see which of your staff attempted to help me.