Direct debit set up but phone payment and this month's bill not paid

[Jludlum]

This and last month my bill and my device plan have not been paid despite the fact I set my direct debit up after having to cancel it due to a bank error back in August or September
I had to pay for my device plan manually last month despite having set up the direct debit and the bill for my data plan on the three app. 

I can't tell if this issue is being caused by the constant system changes on three, my bank or what but it's annoying

[Anonymous]

If Three have confirmed in app that you have an active direct debit (check the bill tab) then your bill will be paid by that method on the date it’s due. 
The issue as you call it is highly likely to be caused by the bank error you mentioned and not Three.

[Jludlum]

I managed to get the bill sorted out but the device payment itself still just hasn't been set up again despite multiple requests with them to resort it