I am writing to express my extreme dissatisfaction with the service on my loan account

I am writing to express my extreme dissatisfaction with the service on my loan account. In June, I made a substantial deposit and was never informed I could restructure my loan. I have now discovered this option existed but was told it's too late. Had I been properly advised, I would have restructured immediately. Due to this communication failure, my loan, originally ending next year May, will be paid up in December, forcing me to pay unnecessary additional interest. When I requested solutions, the account manager stated there were none, leaving me with extra costs due to the oversight. This is very poor service. A financial institution should help customers manage debt, not withhold information that costs them more. I expect a restructuring of my loan.