What can I do if my ex-wife keeps cancelling my agreed visitation days in Dubai?

The schedule does mean something — but only if you enforce it, and you can do that without open war. A visitation arrangement embedded in a custody ruling is a court order, so the first step is building the record: keep every message cancelling a visit, note each date, and reply in writing each time proposing a make-up day, so the pattern is documented while your own conduct stays consistently reasonable. Three months of rolling cancellations is a pattern a judge will recognise. Your formal route is enforcement through the execution court, which can summon her, direct compliance with the schedule, and warn of consequences for continued obstruction. Beyond enforcement, persistent denial of access is taken seriously in UAE family courts: a custodial parent who systematically blocks the other parent's contact risks having that weighed against her if custody is ever reviewed, and she will usually understand this once proceedings begin. If you genuinely want to keep the temperature low, ask the court's family guidance section to mediate first — an agreement reached there can be recorded and still carries weight. An experienced UAE family lawyer can advise whether enforcement or mediation is the better first lever, given how your ruling is worded.