frequent interruptions in internet access

Re tel. ADSL line ***. Despite numerous calls to call centre and numerous reference numbers (from January 2015 onwards), frequent interruptions in internet access (wireless) continue to occur. Problem neither diagnosed nor solved. Not possible to complain or speak to a senior staff member. Call centre agents by and large willing to help but are out of their depth with this particular fault. Escalations ended up nowhere. Urgent action required, as I cannot do my work without internet.<br> Last call centre ref. no. 607CRK220415 . Received mobile message that fault is restored. Well, it is not. No one has been in contact anyway, so how do they know it is restored? Telkom has a very poor service structure. <br> P. Hassiotis