Internet Line Availability

In the past 2 weeks me or my husband have almost daily followed up on the calls that were logged. The line speed ranges from zero to 0.64 mbps. I am paying for a 10 MB line. We don't get that but at least it was about 7.8 MB usually. I am very dissapointed in the service I'm getting from Telkom and I feel that they are in breach of their contract as they are not delivering for what I'm paying for. Everytime there's a different excuse and plan to fix the problem and nothing realises.