Double debit refund ordeal

Vodacom double debited my account in February 2021. I have been promised a refund withing 7 working days from when I first called and emailed them, which was on 23 February 2021. I have since phoned them four times, send 2 more emails and each time they promise me a refund on a specific date, but still no refund 3 weeks later. FED UP!