Kindergarten mathematic 10 + 5 - 5 = ??

Why i felt heart bleeding yesterday? I felt heart attack, almost fell down on the floor, and now i only know what's 'cry without tears'! I've never stupid like that before in my life. All because of my flight ticket problems. I bought the ticket few months ago was 780 euro, and i wish to change the transit destination from Paris to Malaysia instead of England to Malaysia now. I went to Limerick in the early of morning yesterday and i was running up to the center for 3 times til the time they closed. 1st they told me i can change the flight which from Paris to Malaysia is charge 300 euro. 2nd times i was there, they told me that i could not change, one thing i can do is i cancel this flight and purchase another new ticket. 3rd times they told me i have to pay 323 euro for the cancellation fee and i could get back 323 euro 3 weeks later. The price for new ticket is 574 euro. How much i have to pay now is 323 euro (cancellation fee) + 574 euro (new ticket) = 897 euro for everything then i get back 323 euro 3 weeks later. OMG! i was really confusing that time, because i was panic and rushing and i paid for that total amount = 897 euro.

Until the time i on the way back, i only realise how big mistake I've taken. How stupid i was! I kept blame myself, how can i gave 323 euro and i get back 323 euro later? I paid 780 euro for the previous ticket which i bought few months ago, and i paid for everything 897 euro just now then i get back only 323 euro later. So, total amount i paid is 1677 euro and i get back only 323 euro back later, so for one ticket i spend 1354 euro and i consumed 780 euro. I realize what for i paid the cancellation? Why? I was panic whole night til this early morning, my friend ran to the center and explained to them, but they didn't understand til i explain to them with this formula : 10 + 5 - 5 = 10 then they only understood me! That was a huge mistake and they apologized to me in the end. Luckily, they return me 650 euro now. Total i loss for my previous ticket is just 457 euro, i still feeling cardiac pain, but is much better than that amount loh! This is really a good experience and big lesson. I wish the bad luck gone and good luck come to me soon:)