If you raised the issue on your journal, you've done your bit and the ball is in DWPs court now as you've got proof you raised the issue and advised of your income [i advise taking a screenshot to store as proof, journal should never be deleted but you never know what "tehcnical issues" could happen]

Having been on UC when Self Employed, I had a similar issue. Once they generate the "statment" it seems they are able to only delete it and make a new one but they cant stop the payment from going out generated by the inital stamtnet.

In my case they paid me full entitilment and I had to just save it and repay it once I was off UC. So you may likely end up with the same, an overpayment but not through your own fault/intention. Once you come off UC the collections department would contact you to repay the overpayment either in lump or via instalments if you cant afford to repay in full.

As person above said, they only really care about intentional fraud, so if you pointed out the issue yourself, you shouldnt worry about it. It might take some time to resolve but you shouldnt be any worse off for it.