Direct debit is declined

I’ve been facing some trouble setting up my monthly direct debit…
This is the fourth time now that it has been declined while it actually works very well in other companies… Can someone help me ? because Bulb is threatening me to be charged an admin fee for missed payments and even breaking my contract.
I’m not very happy about it!

Have you spoken to Bulb about this?
At what end is the problem?
Is there not enough in your account to pay it or is Bulb not accepting it.

Bulb is not accepting it… I think I’ll have to call bulb to handle it.
The problem is that on my account I can only set up a direct debit while it’s more practical for me by card…