Complain for LTE router data contract 10 gig day and 10gig nite surfer

I have a data contract with telkom that carry over remaining data from the previous month . I had 3.4 gig of data that was supposed to be added to the new 10 gig of September month . On 1st of sept I called and got ref number ***5 for *** LTE router. I called telkom customer care a few times to no avail. This kind of problem has been going on .I kept on reporting but dont get help. In April I had data depleting in 8 days. In May and June the same story . In july it got better now in August again unused data is not carried over. I'm just so disappointed in telkom. Ronnie moffat thanks