Heather Cheetham - Worst ADT Sales Agent

Heather Cheetham, Sales Agent for ADT, met with Lee & I at the property on 20 May 2021 to assess & quote accordingly. She provided us with advice on the ADT equipment including what was needed as part of the installation which was scheduled for 3 June 2021. We received the quote & I made the payment the same day. On the day of the installation, the technicians informed us that the sensor for the garage was the incorrect one & I informed them that it was what Heather advised. The new sensor was more expensive & I disputed this because it was Heather's advice, she then agreed to carry the difference in cost due to her mistake. She confirmed this telephonically with the installer in our presence on 3 June 2021. On 20 August 2021, ADT's Collections Department then called Lee, demanding the payment of the difference that's still outstanding for the change in sensor installed. Lee informed them of what was supposed to happen, that being Heather covering that cost but nothing was done. Lee emailed Heather on 20 August, 31 August & 13 September 2021 - all these emails went unanswered until I emailed Heather on 13 September 2021 at 09h28 when I raised the lack of communication, resolution to the issue & the threat of escalating the matter on social media. She kept making excuses & failed to take accountability. I requested that she provide us with confirmation that the matter is resolved but to date, Heather has still not done what was asked. She is a typical sales agent who wants to sell but the after-sales service is non-existent even when she is responsible for making a costly error.