Laptop disapointment

Purchased a laptop 6 months ago and only got to use for 5 months, when it started having problems(glitching and randomly switching off while in use. when i try charging it it did not want to charge )of which l took it back to the store and they booked it in and process took a month on returning nothing was said of what had been the issue but only to find out it was more faulty including switching off in the middle of class in a space of 10 days for the second time had it booked in , after 5 days went to the store to inquire and spoke to the manager who promised to call back the next day with nothing materializing just an empty promise and l did mention to her that my studies where suffering because of that as am doing IT now am lagging behind ,the team where not forthcoming coming on when it would be back and they could not even find the first job card to say what work had been done. I am really disappointed in their service as they have made me wait a whole month before already and now do not know as their communication is very poor evidenced by last visit on the 18th of July they do not stick to what they promised .