Selfish and untrusted company

Im sick and tired of this company. They deducting for two policies and I only had one policy with them. I cancelled on Feb 2023. Signed their cancellation form and everything, but still deducting. When they refund it's only for one policy. They've been promising to sort it out till to date nothing has changed. It's now my duty to send them my payslip every month for them to refund me. This whole thing frustrates me. They cannot be trusted and I hate everything about this company. Im sick and tired since from Feb it's now month end aaaag