samsung corby s3653 message problem

Hello.
i have samsung corby GTS3653
all my incoming messsages are automatically being stored on my sim. How do i get rid of that setting??
to top it off messages in my inbox are duplicating for e.g. if someone sent me a message at 3.00 pm today.I will receive that message at the right time,BUT throughout the course of the next day i will constantly receive that same message AGAIN and AGAIN and the timer will always say 3 pm still..by doing so my sim memory gets unnecessaryly filled plus some long messages get broken as my sim cannot hold so much space.

all these problems can be resolved if i can find some way to automatically divert incoming messages to my phone and not my sim.it is only when my sim memeory gets full when messages come to my cell.i have tried and my cell has no option to do this diversion.I've searched the net vastly but of no avail.anyone please help.Initially this problem never happened....one fine day when i cleared my inbox and after that day this problem has started.
help me....