Double Billing by Life Healthcare and terrible service

<div>Life Kingsbury Hospital has charged me twice for the same service, a covid test done on 22 Dec 2020. On 25 January 2021 I called and spoke to **** and explained the situation, She promised to investigate and come back to me which she did not. On 6 June 2021 I sent an email with all relevant documents attached to show the error was on Life Healthcare's side. On 23 June I re-sent the email. To date I have not had any response. On 4 July I received a final demand by email from the company. I have tried three times today to call their call center without success. I am at my wits end as to how to resolve this matter.</div>