Rate increase without notification, no response when logging a call.

Vox fibre did not notify my of a staggering R400 increase in the monthly rate payable. This was added to the debit order without consulting me. I logged a call on Friday: VOX***1 and followed up with emails and calls. They don’t respond and they don’t pick up the phone after being on hold for very long periods at a time. Start of my contract was for under a R1000 a year ago, now the same contract is R1699. This is daylight ******* and client services is beyond bad. The service was interrupted 9 times this month only.