vauxhall vivaro electrical help please?

i just got a 51 plate vivaro on 48k and over the xmax period when i was away the baterie died, i have since replaced with a bran new one.
but the vans hazards keep flashing and will not stop till i put side lights on...and drives fine but allso the plug light does not go off.
and as soon as i switch every thing off hazards keep binking and i have to disconnect the baterie to stop it .

can anyone help is it a alarm issue and can it be reset or anything?
many thanks for your time..micky