Ive had trouble with tax credits too- i told child benefit other sons still in education (college) back in august, and they said, not to worry tax credits get info automatically- i heard nothing then other saturday (when they're closed) got 2 letters, one said no tax credit payable, other said i owe them money(a lot!) Rang them monday very upset, turned out its the operators error- one lady rang me 3 times to try sort it, but on the friday she was 'moving to a different sector' someone in technical team would correct it she promised.I heard nothing then got first letter again, saying i owed a lot of money, rang up, a man,who sighed and muttered, 'for Gods sake' under his breath, said its just that computer generates same letter whenever anyone adds any info to the claim-but its still not sorted and its like being on groundhog day! And none of it is my fault! Covid is no excuse for incompetency.If they work in Government bodies there's no room for these mistakes.