The law grants you several rights that you can exercise upon proving your identity.
The right of access (art. 7). You can obtain, at reasonable intervals, without delay and free of charge: confirmation as to whether or not your data is being processed, information on the purposes, the categories of data and the recipients, as well as the communication of your data in an intelligible form and its origin (art. 7). You can also learn the logic underlying any automated processing concerning you (art. 7).
The right of rectification (art. 8). You can require the updating, rectification, erasure or blocking of data that does not comply with the law, in particular incomplete or inaccurate data. The controller must act free of charge and within a clear period of ten days (art. 8). In the event of refusal or silence, you may refer the matter to the National Commission (art. 8).
The right to object (art. 9). You may object, on legitimate grounds, to a processing operation, and object free of charge to the use of your data for direct-marketing purposes (art. 9). This right does not apply where the processing meets a legal obligation (art. 9).
You also have a right to information at the time of collection (art. 5).
This is general legal information, not legal advice. For advice on your specific situation, consult a lawyer admitted to the Bar in Morocco.