WELL GET A JOB I was on welfare for 2 months and it is not something wrong to use welfare but what is wrong is to depend on it makes it a way of life,
any how an answer to your question you can get osap and get welfare but not at the same time,
welfare will keep supporting you until you get your osap on and in case welfare give you money for the same month your osap does example you start school on September 20 welfare will pay for the month of September
but in return osap will deduct the money you get from your cheque and send it back to welfare only for the month of September.
now about your case worker she/he has hundreds of clients and I believe they place people in a priority manner with my respect to your needs I don`t think your furniture need are so important as long as you get your basic needs food/transportation now reporting your case worker which I don`t think it is a good idea because he/she are doing their jobs when it comes to your pay cheque every month any how call your main office give them your case worker`s name and ask who is the supervisor and what is his/her extension or ask them on how to talk to him/her you might get immediate results.
but trust me I was on welfare for a month and i was so happy because they gave me money for food you don`t need more than that to survive.
get a job and good luck with your studies I strongly recommend that you get a job mcdonald`s and tim hortons are always hiring and that`s where i worked at the time.