Ryobi Chain saw not made to lost

I bought a chain saw 3 years ago I did not use it a lot not even 10 hours of use and then one of the blade nuts strip I took it to Ryobi in Montugigardens they say They can not fix it I must buy a new one that cost nearly R700 rand because the problem is not under guarantee, I start use the new one for less than an hour kleen it and pack away, after few months I use it again for 30 min, then I cut some branches of a tree I notice the chain don't get oil and the tank is till full the oil feeder does not work. The tension ***** of the blade start give me problems, are this the quality that Ryobi is given to its customer.