Woolworths made a mistake on till slip and don't answer the phone

Woolworths Edenglen had a special of 4 cans of tuna for R60. FIrstly, they charged me R17.39 each instead of R15. Secondly, they carhed me for a FIFTH can (shich I did not take) for R17.43. So a nice saving of R44 ended up as a saving of R21.02 instead. Still, I suppose it was a saving. When I tried to dial the help line number on the till slip, it failed because they only printed the first 9 digits instead of 10. FInally, after I phoned directly ***), I was "transferred to the manager" - who didn't bother to pick up.

Not a great example of customer service, Woolworths.