Mobile Data Gone

On 12 February 2018 I had 1gig and 64mb of data left.

I was connected to the internet and only used WhatsApp.

On 13 February 2018, I tried to connect to the internet but was unable to do so. I phoned Afrihost to find out why I am unable to connect and was advised that I used all the data yesterday. I said to them that is impossible because I was only on WhatsApp.

I asked for proof of this and they were unable to provide me with same.

This is terrible service and it is not the first time that this has happened, the first time I left it but I cannot leave it for a second time, how can my data just disappear without any valid reason?

And they have the audacity to tell me that their records are accurate but they cannot tell me on what the data was used yesterday.