Laptop faulty

I bought a laptop online, firstly they didn't deliver what was on their catalog, I questioned that and they said they no longer have that one on stock. Secondly the laptop was very slow maybe after a week. I brought it back to the nearest game store. They said they are going to take it for repairs, the laptop stayed on repairs for about 2 months.

They brought it pay saying it is now fixed, they installed a new hard drive. It worked better for maybe 2 days and it became slow again.

I brought it back to the store again. After they kept it for 3 weeks they say I must pay for the service because the laptop is out of warranty now whereas I got it with that issue. Now I'm stuck with that laptop. I can't even open file explorer, it takes time to respond.