Delete Row if Cell Contains Value

I'm trying to search column A from the bottom up to delete an entire row if the cell contains the "Customer/" header info.

However my code below keeps deleting all rows?

'Delete Page "Headers" within Body
Range("A:A").Select
Firstrow = ActiveSheet.UsedRange.Cells(1).Row
Lastrow = ActiveSheet.UsedRange.SpecialCells(xlCellTypeLastCell).Row

'Loop through used cells backwards and delete if needed
For lrow = Lastrow To Firstrow Step -1
    Set workrange = Cells(lrow, 4)
    If workrange.Value = "Customer/" & Chr(10) & "Invoice Number" Then
        workrange.EntireRow.Delete
    End If
Next lrow

Ideally, I will need this once working to delete both that row where "Customer/" is found as well the 2 rows above and 2 rows below, which I think I can do with an offset as well?

Can you attach a sample file. To me it seems would be ackward working on filtered cells. I think the best way would be using a loop somehow from bottom to top. But if the code I suggested doesn't work, I think attaching a file with some sample data to test may be helpful in finding a solution.