Unauthorized deductions

When I received my statement for September I saw I 'had' two subscriptions one for airtime and another for smses,mind you on an old number which I hadn't used since 2016, I went to my nearest Edgar's to ask for a cancellation and refund,and was told it would be done within 30 days, I went back and forth in October, after the 30 days had passed but no refund,and then finally in November there was a refund but only for the smses and not for the airtime, I then contacted their client care again and they said the other refund would appear on my December statement,but I just received that statement and there's no refund..when I first contacted them they said they would conduct an investigation,so when I got the other refund to me it meant the investigation was concluded so I don't get why I received one refund and not the other.