Hi. I have bought two of these abs bo have stopped working within 4-6 weeks. I'm a careful person, 45 years old with no kids using them and I take care of my things. I wanted to leave a review and can't abs want to speak to someone to arrange to get a refund. How do I do this? I am not happy with the chargers. Spent over £15 on two including delivery and now need to buy yet more replacements.