Likely scam as the moment I answered, the call was disconnected at their end. This has happened twice today.

Caller: I don’t lnow

Spam

Phone identified call as spam; no message left, just hung up

hot water upgrade

rang and left no message. Blocked

Did not know number so did not answer. I rang the number from my base phone and it is not connected. I am getting many marketting calls using random numbers from Skytech Sales and Marketing trying to make money out of rebates on hot water. They use call centres in Mumbai. Almost certainly them. Sometimes I answer then as they start their sales spiel I say wait and put them on hold. You need to wait slightly less than 40seconds then do it again. They give up after a little while but I get the satisfaction of wasting THEIR time. It will be the 39th number added to my list.

today i received from same number, i didn't answer, might be spam call.

Some sort of sales scam - I couldn't hear properly. Blocking this number.