Disappointed customer

I bought tiktok data which was 100 mb then it was not working on my tiktok, I then again bought 500 mb and it was still not working, I checked if I had network problems but I didn't, I decided call mtn and told them my problem then they said they'll fix it the next day, I waited the net day but still was not working, my 100 mb eventually expired and I didn't even use it, I called them again they told me to switch off my phone and back on, still was not working, I feel like I just wasted my money coz I didn't use the data and I want a refund, I've been a loyal customer for years but still they don't appreciate I'll change my network