Poor service with repairs

I bought a laptop and 3 months down the line it was having battery problems I took it for repairs and it came back the same and the problem was worse, I took it back again advised them that I use it for work and if I don’t work I don’t get paid. I have never missed a payment, and it’s been 4 weeks with no communication only communication I got was to pay make a payment for a laptop I don’t have and the lady knows nothing about the laptop when I ask how far is the repair. The service is poor I will close my account and never buy from you again.