Disconnects = Telkom/router. I would strongly suggest purchasing a D-Link DSL-2500 single port ADSL modem/router for <R250 in order to test (friends/family can borrow it too).
Otherwise, regarding DNS, should be similar on the DSL-2750:
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But I don't think it'll solve your problems. In any case, rather try use the above setting instead of other DNSes/services IMO.
Will checking that box mess with unotelly DNS settings? But yeah, I've got an old router knocking about I think I'll hook that up and see how it goes as soon as I get out of this sick bed.....bleh!!!