Hi Flo,
Your creditors can send debt collectors round to your house. They don't need a court order to do that. It is very rare that they do though.
If they do call, you do not have to speak to them if you don't want to, and they cannot force you to pay any money to them.
If a bailiff comes round, he cannot enter your house by force, but if you have left a window or a door open, he can enter by those means, but that is pretty drastic and again doesn't happen often and requires a court order.
Regarding the default notice, if you are in a DMP, then you will have to continue paying until the debt is cleared. The remaining debt is only written off if you are in an IVA.
Sharing from experiences of dealing with debt
The greatness of a man is not in how much wealth he acquires, but in his integrity and his ability to affect those around him positively.
Bob Marley.
http://kallis3.blogs.iva.co.uk