Lies and parents

My parents promised me last year to buy me a new computer. Sadly, i was 10 months from a important examination so they promise to buy me the computer after the exam but i really needed it because i need to do folios for the exams. 10 months has passed, no computer. The results for the exams is out after another 2 months, i had straight A's and now they promise me to buy a computer. It never came. Yesterday after another month, we went to a computer shop and i was so happy and excited but my parents were finding reasons not to buy me the computer. I knew it before i left home to the shop that i'm not gonna go home with a new computer only to use my 10 year old laptop which neck has broken and needs support for the screen to stand up straight. Mouse is not working well, memory full, speed super slow and heat from it can light up dry sticks.

When can i get a new computer? I guess never. I had to earn my own money and get it myself when i'm in college, i guess but i am happy to have such parents because i know i'll never grow into a person like this if they never treat me like a stranger everytime i ask them a favour.