corsa wipers?

2009 Corsa :-I was unfortunate/ stupid enough to put mr wipers on during the recent freezing weather. Wipers were frozen to screen but moved a bit. Now that the cold weather has gone my wiper blades appear lower down than usual and when operating the one in front of the driver hits the pillar and also the plastic at the bottom of the windscreen. The problem is intermittent, its actually ok when he screen is dry (not really a lot of use!) but is really bad once the screen is wet. I've obviously bent/ dislodged something and happy to give anything a try before taking it in for a pro to look at, tut and part me from my cash. Any ideas?