Not Skytech Limited, that is a fake name they use! It is either of the following and all energy related spam/scams.....
Netsip Pty Ltd
Vic Energy
Smart LED
Symbio Pty Ltd

Caller: indian claiming they were doing the government scheme to replace light bulbs

caller called with thick indian accent trying to get me to replace my light bulbs to LED I already have LED.

I didn’t recognise the number so didn’t answer. Called at 6.25:pm. Probably scammers.

Missed a call from them. Not sure who it is

Call and don’t leave message

Caller: Sky Tech Limited

Spam. Called back and it mentions you have called Sky Tech direct marketing service and prompts you to press a number to talk to an agent. Block and delete.

Another of those calls with last few numbers changed starting with 03-8580 xxxx. No message left. Blocked.

This is a recorded message from Skytech limited

Caller: Marketing spam

You have been called by skyaid marketing

I don't answer unknown numbers and unsolicited calls. Don't call them back either. Once blocked, they call from a different number in a few days. Very likely connected to (03) 8580 9791. Don't know who they are.

Caller: Skytech Marketing

Three missed calls from this and a similar number (8580 9790) over the past week. No meesage, but when I called back with caller ID off, I got a robotic American-accented message inviting me to "press 1 to connect with an agent".

This caller is a pest. Has continued to phone - as soon as I block it, there are slight variations on the number and it all starts again.

Ignore and block.

Caller: Skytech limited

Number called & my phone told me, it was suspected spam, so I called the number back, msg says you have called skytech limited, you have been called for sales & marketing. Have now blocked it