I would probably be a lot more indirect about it. Thank you for helping us find the issue. We will work tirelessly until it is fixed. If at some stage you are

I would probably be a lot more indirect about it. Thank you for helping us find the issue. We will work tirelessly until it is fixed. If at some stage you are satisfied we would be delighted to turn your one star review into a five star one. to Thank you for helping us find the issue. We will work tirelessly until we turn your one star disappointment into a five star experience.