Incredibly persistent mob. The other numbers they use, some of them multiple times, include (02) 4057 6378; (02) 4216 7620; (02) 4216 9273; (02) 6189 5524; (02) 7250 6516; (02) 7256 8189; (02) 7259 8055; (02) 8766 4941;
(03) 4053 8524; (03) 7044 7066; (03) 7044 7067; (03) 7503 2563; (03) 7503 2607; (03) 8824 1855;
0485 842 406; 0489 923 074;
(07) 3062 8864; (07) 4463 9269; (07) 5321 5885; (07) 7510 9142;
(08) 5115 2570; (08) 5115 2575; (08) 5115 8503; (08) 5116 0509; (08) 5116 0510; (08) 5116 0511; (08) 5116 0526; (08) 5116 0537; (08) 5116 0540; (08) 5116 0546; (08) 6244 9882; (08) 6383 7280; (08) 6385 2181; (08) 6715 5610; (08) 9566 5427; (08) 9566 5433; (08) 9992 6539.

Probably a scammer to do with a link on a website that was supposedly for QuantumAI.