1Department of Mathematics, National Institute of Technology, Rourkela 769008, India 2Department of Applied Mathematics, Institute for Groundwater Studies, University of the Free State, Bloemfontein, South Africa 3Department of Mathematical Sciences, North-West University, Mafikeng Campus, Mmabatho 2735, South Africa 4Department of Mathematics, Yildiz Technical University, 34220 Istanbul, Turkey 5Department of Mathematics, Faculty of Art & Sciences, Celal Bayar University, Muradiye Campus, 45047 Manisa, Turkey 6Department of Mathematics and Institute for Mathematical Research, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia