Erica case

I got my migration notice last week for the move to UC, my deadline to claim date is not until the end of November and I have not claimed yet as I am waiting on a hospital appointment that could affect the claim (obviously if it’s not come through soon I will just claim before November) Anyway, my tax credit payment usually hits my bank account every 4th Wednesday, however it has not gone in yet today. Is there a problem with payments? I’m worried that if it doesn’t go in I am going to seriously struggle. Do payments stop once you receive the notice to migrate to UC, because from what I can tell via the info online, my payments will only stop once the deadline date has passed if I have not made a claim for UC? I will try to call up in the morning but I know how hard it is to get through.