Cell C fibre connection always slow

I have been paying for a 10Mbps fibre line from Cell C. If you get a close to quarter of this speed on a speed test you are lucky but generally the speeds are far less than this. I have reached out to your fibre support team and they are so nonchalant and casual. Here is a snippet from there most recent response - "Another reason for intermittent connection could be cabling. Please kindly check that the cables are not bent." They did not even reassure me that of what they see on their systems as it pertains to my line. This is really frustrating especially if it consistently happens and you barely complain. This essentially means I have been been paying for way more than I have been getting and is rather deceptive. How can your customers continue to trust you?