Replacement Router DOWNGRADE. WHY??

Issues with router, so i had a ZTE RAIN router which started to fail and for a year i called and called Rain to replace the ZTE, i asked to not degrade my router, as the ZTE worked very well, and fast. Every time i did call, they offered me a new contract to the package that has their router, which does not take a SIM, this cost more for less speed, and as per my contract, RAIN is required to supply a router if the one i have breaks. I dont want a whole new SLOWER contract that costs me more every month, and this would also be ********* for them to only offer me this new package, as well as a violation of the contract.

Since they would not do anything i purchased a TP-Link 5G router, which with the SIM in gets perfect signal, but due to RAIN blocking devices with their firmware, it could not connect so i wasted R5000.

So they finally come to exchange and give me a used OPPO router. I even asked the call centre agent, and the delivery guy, if it was a downgrade and they all assured me it was a newer model and therefore a better, upgrade, compared to my previous router.

And it was not an upgrade and quite frankly a hard DOWNGRADE, not only are the hardware specs of the OPPO a lower tier than the old ZTE i was using (I had the ZTE for around 4 years already and know even new ZTE routers are upgrades) but the signal is a lot worse in the same place in the house, i have to reboot it weekly now, or else it seems to be on a second slower tower, and it is affecting my daily work so my life.

Old ZTE: 150Mb/s to 200Mb/s New OPPO: 50Mb/s to 100Mb/s if i am lucky but usually around 80Mb/s

I need a router EQUIVALENT or an UPGRADE from the ZTE, i have called so many times, left email and messages on their Chat Bot,. always promised i would get a call back and given a ticket number, and never hear another thing.

This is pathetic service, and no wonder iBurst died how it did, RAIN may be following in those footsteps.