Makro Online Non-servuce

I bought a Ryobi 4 stroke lawnmower last month from Makro Online. It was delivered on time. I put it together and started using it. It worked well for the first week, but on starting one day, the exhaust was very smoky and there was oil leaking from the exhaust. So i contacted Makro, and that when the run around started. The initial interaction after me email letting them know of the problem was fairly quick, but then I was contacted by them to inform me their manager was going to contact me that day. Of course this didn't happen. I was then contacted the following day and told the manager was going to contact me, and you guessed it, that didn't happen either. I sent another email and was then told the courier would be picking it up on the Tuesday. This didn't happen either, so when i contacted them again by phone, I was told they would get back tome later in the day, which once again didn't happen. I telephoned again this morning, only to be told they are waiting on their courier company to see when they might be able to pickup the lawnmower. Not feeling confident this will happen.