As long as you did not get to the stage where the engine was knocking hard, then i think you noticed and stopped just in time ,
Sorry this happened but time will tell.
The octane of petrol is very high compared to diesel and will causes the engine to work against itself and knock then cause internal problems .
If the job was done fast and the system flushed asap then the petrol in the lines and injection pump should be ok, if the flush time was long then the petrol in the lines and fuel pump
may of caused internal seal damaged .
As said if the engine is now running fine then you may be okay .
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