Hi, thanks for your question, sorry for the delay in responding, I have not been online much this weekend. Are you sure you are on a tourist visa? If so, then you would not have been able to work. Do you perhaps mean the e-visa which is then converted to a full working visa?
If you are on a tourist visa you have the right to stay in the country for 30 days but you cannot work. I think you really ought to review and confirm your visa. Normally, if you are going to work for a school they deal with all the paperwork for visas and you get an e-visa which then upon arrival they take your passport and apply for the full visa. If this was not done then they and you could be in trouble under the strict labour laws.
Labour matters in the UAE are governed by Federal Law No. 8 of 1980 Regulating Labour Relations as amended by Federal Laws No. 24 of 1981, No.15 of 1985 and No.12 of 1986 (the “Law”). If you resign during your probation period "for no just cause" then the school only have to pay outstanding wages, they do not have to pay your repatriation costs. Further, if you are deemed to have left employment without a justified cause before the end of a specified there in the employment contract then the UAE labour laws decree that you are banned from working in the UAE for a period of 12 months thereafter. Usually however, such sanctions would only be applied if a complaint was filed by the employer requesting such.
The probable reason the school is threatening this is that they may have brought you over without a valid visa and are concerned about the consequences - they can be fined up to AED 10,000.
I would email them and advise that as they have failed to arrange the appropriate working visa (if of course they were the ones to arrange the visa) and you are on a tourist visa you are entitled to stay for up to 30 days, which you are intending to do and that you will email them details of your flight in due course. Of course you can always advise them that you are concerned that they have misled you are you believed you were coming on a working visa (if of course you are on a tourist visa) and that should they approach the police with regards ***** ***** complaint you will have no alternative but to seek legal representation to file a complaint against the school for bringing you into the country on the incorrect visa and having you work.
I hope this assists. But I should warn you, do not commence any work at all with any other institution without the correct visa.
If you have any further questions, please ask.