DHL is running away from paying back deposit, it's been 5 months now.

I ordered an online express shipping service in October last year(2020)for the parcel I mistakenly left at the hotel in ****et. I paid online and about 20% deposit was deducted....a couple of days later invoice was issued and the deposit was supposed to be refunded to my bank account. That was on 15/10/20 to be precise. I called DHL many times with a promise to get money in 14 days, then 30 days and eventually now 5 months later the South African office claimed it's the ****et office that's responsible for the refund and there is nothing they can do about it and also after a couple of emails on which I was given different timelines for the payment to come through to me. Official who communicated this is Akhona Mvuza, Customer Care Executive ZA, followed by Avery Visagie also Customer Care Executive ZA