how do i fix wipers on my megane coupe cabriolet ?

since the big freeze last week where my wipers stuck to screen they now dont work at all, there is a click when engaged but no other sound nor movement unlike once before i had a problem with them, having left them on intermittent when shutting off they stopped working but manually manipulating them got them going again, this time that doesnt work and even seem to be unmoveable manually. any adivce would be appreciated.tried the fuse thats ok.
Thank you