If your bank is still active on your PayPal account contact your bank and see if they can re-setup up the cancelled DD, sometimes they can, sometimes they cannot. If they can then you can continue as normal from that point on. If they cannot then you should remove the bank from your PayPal account, re-add it back on and then confirm it from scratch again.
If your bank has been removed from your PayPal account then you will need to contact customer services and request they re-activate the bank. Once it's re-activated you will have to add it back on and set up a new Direct Debit through confirming the bank, as above.
I know that's a bit complex but I hope it makes sense!
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