Bought 2 sessions and would like to buy another one

Hey support

Lost my 15 lifetime key during the lately changes, fine for me as I havent botted for last 2 years and the keys I bought few years back paid back few times for me

My question is as I bought like 1 week ago 1 year session, then few days latter bought another one but I see that 3 session for 1 year cost like 60euro, can I have a chance to pay this missing 10 euro to get 3 session ?

Not sure if it possible like that if not maybe refund those 2 session that I already have and will make another order for 3 session ?