Double charged

I thought my payment option was on cash so when we arrived at the destination I asked how much is was, driver said r68 so I paid and we parted ways. When checking my banking app the following day I saw a deduction of r48, when I went to the bolt app I saw my payment option was on card and there was a r20 discount. I immediately contacted the driver via sms asking that he transfer my money back but he ddnt answer and when trying to call ***) says "unfortunately we cannot forward your call anymore" does this mean he blocked my number? The driver is Mpendulo Arthur (polo vivo FB05RX.GP) how do I get my money back?