Bad service from Hollard Travel Insurance

I had to travel to Mauritius at short notice. My Travel Agent took out Travel insurance through Hollard on 5 July 22 for travelling to Mauritius the following day on 6 July. On receipt of the Hollard Policy I noticed that the policy indicates that I will not be covered for Covid 19 due to my age. I immediately cancelled the Hollard insurance on 5 July and arranged alternative insurance through TIC (Travel Insurance Consultants) who offered me full coverage at my age. Hollard refuses to refund me for the cancelled policy. They do not respond to my repeated e-mail requests for a refund over an extended period of time.