Random or in a specific time?
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If the data is missing in key moments, you can be sure that your backtest will be unreliable.Change broker or use external databases.
Most seem to be there, since 1999 I think, only a great fragment is missing around September ''11 to December' '11.
That is a fairly significant hole.Try with historical data or even those of Metaquotes directly, to see if you improve coverage.
Contacting the broker is like asking the Olmo pears.Better look for other data sources and stop wasting time with incomplete demos.