Unfortunately I didn’t receive the rejection notice in good time and the fine has risen to £130,
Which means what exactly?
They re-offered the discount but it had lapsed because you were away from the address, possibly on holiday?
Or, you don't live there, your V5C is wrong and you're relying on someone to forward in good time..but they didn't, or....?
Are you the registered keeper, is your V5C where you reside and why did you not receive the NOR in good time?
In any event, pl post the NOR and your reps.