Online language school

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First time posting here, but its business related so here I go.
I'm starting an online English school and I am looking for ways to promote and market my business. I'd be curious about what you recommend but I'm here specifically because one of these ways is simply making ads in classifieds websites. The problem is a lot of these websites require a local telephone number. At least all the good ones
Whats the best and cheapest way to get a local telephone number? I'm considering investing in a virtual number for UAE but its not in my budget right now. I can make room for it in the future but immediately I cannot.
Let me know what you think. Not all of these websites use SMS verification so I wouldn't have a huge problem with setting up some random guys phone on the classified website. There is a website that generates random phone numbers but not the UAE and Skype does not cover this either.