You don't have to file a return if for the 2012 tax year you earned less than R150 000, but you most definitely can submit a return. If you didn't work the whole period from 1 March 2011 to 29 February 2012 then you may be entitled to a refund or depending on what your income is. If you look at your IRP5 that your employer gave you, the PAYE should be around R10 825, if it is very different then you should probably submit your return.
You don't need to go into a branch to register for a tax number. Register on www.taxtim.com and follow the prompts or go directly to https://www.taxtim.com/za/get-a-tax-number.php and download the form and follow the instructions.
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