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Do I need to re-send

For the second time, I have been sent a request for evidence of my income. I put down the <£5 bank interest on the initial form as that's all I get. (Non employed parent, formerly in receipt of contributions based ESA but that finished before the tax year in question. Other (employed, does a tax return) parent has not been asked for additional evidence.

I was then asked for my evidence so I printed out the bank statement and sent it off before the (very short I have to say) deadline on 18th May. Today, I've got another letter dated 26th May saying exactly the same thing, with a new deadline of 9th June, but it says 'if you have already returned the financial evidence confirmation form' to us you do not need to respond to this request'.

Is this letter code for:

1) We haven't received what you sent

or

2) We think you have more income/evidence

So do I need to do anything or not?