Declined payment method

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.

Please help me I don’t know what to do !

You need to speak to Bulb to explain your difficulties.

Thanks I will !