Bad service they pulled another payment when my subscription was paid in full last month

Good day I had a subscription with rentoza for cell phone Samsung A21 I paid it for 12 months and last month was my final payment just my luck rentoza pulls another payment of R530 but it was paid up last month I've tried to contact them from Saturday the 26th and no refund has been paid to me there service is very bad on email and there whatsapp number there is no contact number so it's a nightmare to deal with them I send a WhatsApp and don't even get a response send an email and no response all I want is my R530 refund to be paid back to me and I will never use them again trust me people you will be dealing with people that take service as if it's nothing