Laptop developing defects within onsite warranty period but company denying service

I purchased a laptop with an onsite warranty through an online selling website. Soon I realized that the laptop was very slow for its configuration. Upon approaching the company, they said that this speed is the normal speed for this particular laptop and if I want to increase the speed, I shall have to spend a good sum to increase its RAM. Because the laptop was very slow and the company was charging too much for the RAM, I had to get the RAM increased privately. The speed issue thus resolved without the company's assistance. After a few months, the adapter of the laptop stopped working. Despite an onsite warranty, the company refused to send home a technician and resolve the issue again. Hence, again I had to make private arrangements to be able to continue using the laptop and let the matter go. Final nail in the coffin was a pixel defect that was reported to the company 2 months before the expiry of the warranty. Again, despite the onsite warranty, they refused to send a technician and also declined repairs stating that since there was ONLY ONE SPOT, they will not repair it. This policy was not communicated to me at the time of purchase of the product and is not mentioned anywhere in the papers provided to me. On seeking an explanation as to why should a single pixel defect not be rectified, I was given no response at all. The laptop has poor reviews on the online selling website and people are suffering the same issues as me. I wish to approach the Consumer Court to return this laptop and get a refund as the product sold is not upto the mark and the services for the same have also been repeatedly denied to me. Will I get a favorable ruling in this case?