Pending funds

Good day from 25 march 2018 I used a online service to top up data. There was a error and the transaction was cancelled but it took my money. I tried the service a few times to see if the error would be fixed without noticing they are taking money every time so I have a couple of transactions pending for so long. I phoned the bank a lady told me it is on the merchant's side. But the merchant cancelled the transactions. The money is now haning in limbo for a while. Could you please assist? Thank you Kindest regards Thinus Geyser