So it sounds like you thought you had a job to go back to but you are being treated as if you quit.
And if that is the case you are entitled to termination pay.
That means that you are entitled to receive reasonable notice or pay in lieu of notice.
Generally, in determining what is reasonable notice Courts look at several factors including the length of time you worked for the employer, your age, your position, the likelihood of finding new employment etc.
At the high end, if you were in a managerial position, the Court would likely order one month's notice or pay in lieu of notice for each year of employment. If you were not in a managerial position the Court would order somewhat less.
There is no likelihood that they are going to listen to you so your next step should be to consult with an employment lawyer in your city face to face. The lawyer will send a demand letter threatening a lawsuit. The letter will not cost much and will be worth it.
Then if they don't pay you, you can either file a complain the Employment Standards Branch if they can still help but you may be out of time, or you can sue them in Small Claims Court and can self-represent. If it gets that far and you find you need some help as you go through the process you can always post on this site again and I can assist you further.