Have you submitted the return to HMRC manually, as I notice your account isn’t set up to file electronically?
Basically, here’s where you’re at:
1. If you’ve submitted the return manually to HMRC
1.1 If you’ve underpaid in your return
You will need to write to HMRC and ask them to reverse the VAT returns so that they can be re-posted.
1.2 If you’ve overpaid
This can typically be corrected in your next VAT return by manually adjusting the boxes.
2. If you’ve only created the return on QuickFile
You can simply roll it back, correct the errors, and re-run it