DISAPPOINTED CUSTOMER: Contract cancellation x 3 with no refund in sight

I cancelled my laptop contract on 23 June 2021. But they migrated it, which was not the request. I then had to cancel it again in October 2021. In both cases I was given a reference number. Only to discover in March 2022 that this contract was never cancelled. Ive been billed until I managed to cancel it once again in April 2022. Ive tried to contact the Retention department using the number I received as well as 135 but has been sent from pillar to post. Until now I have had no success in sorting out my concern or attempting to get a refund. This is such a bad situation since Ive been a loyal customer for 20 years.