Telkom evening and weekender plan

As I need internet in my flat, I ordered a Telkom evening and weekender plan to receive a landline. I phoned Telkom to double check that there are no installation fees on my evening and weekender month to month plan, they repeatedly confirmed that there won't be any installation fees. The lady, however, told me that when I receive my invoice, the installation fee of R639 (excl. VAT) will be on it, but told me to phone Telkom after I received the invoice so that they can refund me on my installation fees. She gave me a reference code/number to use, and so I did. I phoned them, gave the reference number and explained my scenario just to hear that suddenly you do get charged on the evening and weekender plan if you do not have a 12-month subscription. This is after they told me several times that I will not get charged the installation fee. My friends actually warned me that Telkom will charge me even when they shouldn't, but I still trusted they would not. I am very disappointed.