Suspicious card replacement to have new R50 monthly fee.

Today card machine number 5 stopped working. The device is not old. 4 the other 4 devices I received a free replacement, but now the card machine have a R50 per month fee. The fee is not the problem, the way you go about it seems suspicious. I do not think for this happening while I am busy trading without incident, is unnatural. Thank you for the lost sales!!!