I buy a GAStoken contract which requires say 21000 GAS at 1 Gwei and later when we delete/destroy the contract when the Gwei is around 50. I understand that we will get around 50% refund of GAS at the current Gwei. The idea behind this is to use the refunded GAS to lower the transaction costs for subsequent transactions. Can someone point me as to how to claim/use this refund?
I'm a newbie to this space and AFAIK GAS cannot be stored. Please correct if I'm wrong.