Not loading data bundles

For the past 2 days every time I buy daily data bundles, they deduct the money and even send a message that the bundle has been loaded. However the when I connect to internet it uses the balance of my airtime... I have wasted over R80 because of this. I’ve been trying to contact the call center but it’s hard to get through because of high call volumes so I’m guessing a lot of people are experiencing problems with this network. I’ve been with Telkom Mobile/8ta for years and I must say the service delivery is deteriorating at a very rapid. I’m thinking of switching to a more reliable network?