when i enter the old address (0xc3972ac283b3a7a56125674631a5c254f7f373cf) to swap my coins in myetherwallet i get this message :
-------> invalid argument 0: json: cannot unmarshal hex number with leading zero digits into Go struct field CallArgs.value of type *hexutil.Big
Please join Hawala telegram group for urgent assistance
https://t.me/hawala_chat.
i already posted in the telegram chat but no one answered me!! i didn't send my tokens yet
Please wait a little. Our main dev is sleeping right now so I can't contact him. I'll get back to you with this as soon as I can.
ok thanks

OK, so I spoke to one of our devs and he says it's the MyEtherWallet problem. They probably did some update that didn't go through like it was suppose to. Try now or wait for it to be fixed.
Additionally, you can try typing the contract's address into the field on the web site. If you pasted it, maybe it got some hidden characters in it that causes that error.