reconstruct amount of time with excel

I have a reporting tool that formats the amount of time data as hh:mm / h:mm. When the csv is generated and opened with excel some of the data is misrepresented.

For example 39:52 (39 mins, 52 secs) becomes 39:52:00 (39 hours...) but the strange thing is this doesn't happen to all the data, it seems to only do it when the data exceeds 23:00.

I would like a formula to be able to reconstruct the values as follows:

• If the cell value contains a single column : e.g. 10:16 then prepend with 00: so it ends up as 00:10:16
• If the cell value contains two columns : e.g. 39:52:00 then reconstruct a new value by dropping the trailing :00 and prepending with 00: so it ends up with 00:39:52