Do not travel with Singapore Airlines from South Africa

I would strongly discourage the use of Singapore Airlines from South Africa. I've booked flights to Bali. 1) On 2 occasions the flights were cancelled by the airline and I was forced to change dates. 2) One cannot get through to the local (Johannesburg ***) offices. One gets put on old for 15 mins to an hour (and nobody answers the call). I've done this on about 7 occasions (waiting for 15 mins to an hour) with only 2 successes (over a period of months). 3) After engaging with the airline on the phone (the 2 occasions), I was told that I would get called back within 24 hours regarding confirmation. This did not happen on both occasions. 4) There are no responses to emails (sent to ***) or telephonic contact after 20 days of sending emails. I'm simply trying to change the date of a return flight. 5) I've been trying to change the return date of a flight since 20 Dec 2021 via telephone and email. To date (09 Jan 2022) there has been no response from the airline (3 emails and 6 telephone calls)