Is the net wages account at nil? Was it at the start date of the P30 summaries you have? Have payments to HMRC all been recorded correctly/match. Reckon you will need to tick back each account individually as the error could be anywhere - missed info/transposed, etc, could be anything. Sorry but the best I can suggest is roll your sleeves up and get ticking.
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Joanne
Winner of Bookkeeper of the Year 2015, 2016 & 2017
Thoughts are my own/not to be regarded as official advice,which should be sought from a suitably qualified Accountant.
You should check out answers with reference to the legal position