Student finance not recieved

I changed bank account last minute when already transferred the payment to my old account and money hasn’t arrived in my old account bank says no money has arrived student finance says it’s paid now slc has put grace memo which can take 6 weeks but not guaranteed is there anyone else had same issue If money didn’t go to any other account and neither in mine what’s going to happen with this how long does it takes trace memo how this works if bank advices it was never transferred to our side what’s going to happen?

I changed bank account last minute when already transferred the payment to my old account and money hasn’t arrived in my old account bank says no money has arrived student finance says it’s paid now slc has put grace memo which can take 6 weeks but not guaranteed is there anyone else had same issue If money didn’t go to any other account and neither in mine what’s going to happen with this how long does it takes trace memo how this works if bank advices it was never transferred to our side what’s going to happen?