Marketing company offering free Coles vouchers.

I started getting these calls, which I don't answer or call back, after I completed a "survey/competition" on ebay. They call nearly every day, and so does a number which is apparently some holiday sales place. Bloody nuisance. I can't block calls on my fone.

Nuisance call, they are very persistent calling me every day. I have now blocked this number.

call centre constantly ringing to sell products

Yes there a pain in arse.
U can get these vouchers on line for free too.
I'm going to Aldi !!

Revived a couple calls but no answer as I don't know this number and they call at very unusual times

This number keeps ringing me. I tried ringing them back but I got the busy signal.