Very worried about DLA change of address

Hey guys, i'll keep this brief and stick to the facts, my mother in law who lives with me and my husband is claiming DLA and has been for the past year, 7 months ago we all changed address, and totally forgot to inform the DLA about the change of address, we have only now realised the oversight and i've rung the DLA and informed them straight away, however the lady we spoke to on the phone seemed to be very arrogant and rude, so now i'm worried about what's going to happen, my mother in law's care needs have not changed at all, but myself and husband both do shift work, and totally forgot about it...

has anybody else had this problem or knows what will happen?????

thanks in advance