Phoned tax credits helpline 2 weeks ago to give estimated income for this tax year to avoid any overpayments. After holding for nearly an hour I gave the information and today got a letter with totally incorrect information which will result in - you guessed it- overpayments!
So I spend another hour on the phone sorting it out and also find out they have incorrect childcare provider details which I had updated them
with at least twice. Seems to me they can't ever get it right! Even if you do update them they get it wrong and then blame you if they overpay!