This code will help you what you have asked.
Sub MergeSameCells()
Dim Rng As Range
Dim xRows, lastRow As Integer
lastRow = Cells(Rows.Count, 1).End(xlUp).Row
Range("A2:C" & lastRow).Select
With ActiveWorkbook.ActiveSheet.Sort
    With .SortFields
    .Clear
    .Add Key:=Range("A2:A" & lastRow), SortOn:=xlSortOnValues, Order:=xlAscending, DataOption:=xlSortNormal
    .Add Key:=Range("B2:B" & lastRow), SortOn:=xlSortOnValues, Order:=xlAscending, DataOption:=xlSortNormal
    .Add Key:=Range("C2:C" & lastRow), SortOn:=xlSortOnValues, Order:=xlDescending, DataOption:=xlSortNormal
    End With
    .SetRange Range("A2:C" & lastRow)
    .Header = xlGuess
    .MatchCase = False
    .Orientation = xlTopToBottom
    .SortMethod = xlPinYin
    .Apply
End With
Set WorkRng = Range("A2:B" & lastRow)
xRows = WorkRng.Rows.Count
If WorkRng Is Nothing Then Exit Sub
Application.ScreenUpdating = False
Application.DisplayAlerts = False
For Each Rng In WorkRng.Columns
    For i = 1 To xRows - 1
        For j = i + 1 To xRows
            If Rng.Cells(i, 1).Value <> Rng.Cells(j, 1).Value Then
                Exit For
            End If
        Next
        WorkRng.Parent.Range(Rng.Cells(i, 1), Rng.Cells(j - 1, 1)).Merge
        i = j - 1
    Next
Next
Application.DisplayAlerts = True
Application.ScreenUpdating = True
End Sub
Try and let me know if it works.