I’m sorry for you.
At the other side, in Germany we have many fans of the Miboxer charger. We don’t notice strikingly high failures.
The Miboxer charger has many very good advantages with less price, comparing to other manufacturer.
Miboxer is a chinese company (like most other charger manufacturer). So what kind of customer service do you expect (From China to Canada)? Best would be, to order at Amazon or Aliexpress. So if there is a problem, you can claim at them and the will help you.