Telkom ISP Faulty

We have had no outgoing business e-mails for 4 days despite repeated calls to the call centre as well as numerous web requests. We've spent hours on the phone (Plus the several web requests) & now they've simply stopped responding even after we described to them the exact problem & them having admitted it is an Telkom issue. We have asked for feedback or at least an answer so we can go forward & cancel our agreement with Telkom & take our business elsewhere.