I called back number 0477 660 688 reached voice mail but did not say for what company.

This same telemarketer or jerk has several mobiles that they change the number and continue to call 0477 660 655 0477 660 688 0477 660 300 0477 660 622 - i have told them not to call however they have bought the same series of numbers from telstra I think not sure how to mark them or get rid of them as they just get another number.

some sort of financial services

spam caller. continues to call but doesn't leave a message