Zyxel Telkom modem issues

Hi telkom. Im having some issues with my fiber conection at home. Its been giving me issues with my wifi disconnecting for a while now and i have to restart the modem. As time went on its now gotten so bad where i have to restart over 5 times a day until i eventually give up. I sat on the phone with telkom support last week for 2 hours and still the issue persists. I was told to take the modem in to the telkom shop in centurion and they confirmes the modem is faulty. Now my problem is you guys have been really good to me over the years until now. The telkom shop trys to sell me a new modem telling me even though its under warranty they will replace with the same modem again and these modems are all faulty (zyxel). They said i should have taken the dlink when the guy came to install but i was never given a choice. The senior tech called me and said the same i must rather buy my own modem. I cannot be left without internet for 21 days as your store told me for device repair. My connection is less than a year old. How can i swop out this modem for a dlink? Can i swop it out for the same modem so im not left stranded? Should i cancel my fiber line and go with someone else so i can get away from this modem? How can you help me telkom?