After you file

I got the CP09. I got a partial refund but the irs caught the mistake of it not being claimed. I'm not three only one from what I see. Turbo taxe reps said it was my fault. Its disgusting that they guarantee correct max refunds but wont hold truw to the promise we as consumers pay for. Never again lesson learned. Yes I tried to call the irs several times. Surprise it was shut down durring to covid. Any more brilliant suggestions?