Array Milti Sort problem

I have an array of customer accounts. Each element contains an array of data for each customer. I want to sort by column 12 (the ZONE) and then by an additional column of the users choosing. So I am adding two sort columns

What I expect to see is the array first sorted by the first added column and then a sub-sort by the second added column with no mix up of data.

What is happening is that the data in the first added column no longer corresponds to the original row entry. This renders this class useless.

A sample of data and Your code would be usefull, like:
print_r(original_array);
//some coding here
print_r(sorted_array);

I have an array of customer accounts. Each element contains an array of data for each customer. I want to sort by column 12 (the ZONE) and then by an additional column of the users choosing. So I am adding two sort columns

What I expect to see is the array first sorted by the first added column and then a sub-sort by the second added column with no mix up of data.

What is happening is that the data in the first added column no longer corresponds to the original row entry. This renders this class useless.