Guarantee is a lie

I purchased a vacuum cleaner in August and it started having issues. when we took it to Game they confirmed it was a faulty motor. Though told me it was our issue due to the vacuum cleaner being to full? Firstly how do they prove that , secondly it is under guarantee and the motor failed? Does this not mean they should repair it. Such bad customer service. They actually returned it without repairing it. Makes you think how much integrity does a company like this have? Their \guarantee"is a lie. Going to speak to their staff is futile! they hire people who barely understand what you are saying. All in all a terrible experience. """