installation not done when expected

I purchased an oven and hob on Saturday. The sales person was very helpful, we were approached by another salesperson selling the installation vouchers,he indicated to us that the installation of our oven and hob would happen on the latest Monday (which is today) and that it would cost only R400, he further indicated that the call centre would be in contact with us. <br> This morning (20 April) I had still not received any call regarding the installation, I took it upon myself to call and find out, I spoke to a lady who had indicated that they had not received anything about this installation and was not aware of it. She did however say that installation will still happen today and proceeded to take my details, from this phone call it was further determined that the voucher sold to us was wrong, the sales person sold us a voucher for R400 instead of R650, so we have to pay an extra R250 now<br> To add insult to injury, we received a call at 15:00 to indicate that they had only just received notification of installation and that it would now happen on Wednesday. This is frustrating service, clear indication of *********** staff and bad planning at my expense