vacuum cleaner

purchased a vaccum cleaner from Makro in June or July 2017. Used it 1st time in August 2017. Machine stopped functioning effectively in less than 6 weeks. Took it back to Makro, machine was tested by Tevo rep. & booked for repair. Machine was returned after 2 1/2 weeks with report that the filter was dirty. 4 weeks later, same problem. Checked filter, it was clean. Cleaned it again. Tried machine, still not working. Contacted Tevo, they collected the machine in November 2017. To date, they have not returned the machine to me. They refuse to refund my money. Will never buy a Tevo product again & will not advise anyone to do so.