Unacceptable Support Service

I have a portable router that I purchased through VODACOM with a data contract that provides me with data each month. On the 2nd of January, I purchased an additional data bundle through the Vodacom application as I will be needing this for work purposes from a remote location. This data bundle did not reflect even though the amount was immediately deducted from my bank account.

What I don't understand is why this service that I already paid for was not delivered to me. There was no issue claiming this amount from my bank but the service did not deliver.

I spoke to 5 different operators- I was put through from the one to the next repeating the whole scenario and answering numerous time-consuming questions. After 4 calls and an hour later on the 2nd of January, I was promised a call back the next morning from an operator. I was told to email the POP to an address and thereafter, I did not hear from her again. Another 3 calls were made that day to 135 (the first two simply cut off after spending some time going through the automated process). They are also unable to provide me with contact details of anyone who can assist me, instead, I have to go through the whole automated process of pressing one then 5 then holding etc. After emailing my POP twice to two different email addresses (all using my time and cellular data) and another hour on the phone, I was finally credited back my amount by an operator but I still don't have any explanation on why this error occurred. Now I can't purchase more data because I am unsure whether this will even reflect to be used. How must I depend on service this unreliable?