Incompatible 5G sim & Router

Took out a 5G sim package with a router that was apparently not compatible with the sim. It worked horribly for 2 months and then just stopped working 3 weeks ago. Despite numerous references, network guys said all is ok and I was referred to the store. I reluctantly went back to Killarney Mall Store as the contract was take with them. The Neanderthal (Noel) who is the manager had the audacity to tell me that I was using the wrong router for a 5G sim and I simply retorted with I wonder which smart shop gave it to me and of course lights out because the 1 neurone that was firing suddenly went into load shedding. He refused to replace the sim & or router because he did not know what I had done to the sim as it was damaged. I left the shop and called Vodacom and was told that there was nothing they could do as the deal was done at the store….amazing. I left the faulty router/sim with the store and no assistance whatsoever from Vodacom H/O. Been with Vodacom for over 20yrs & have 8 contracts. The network Companies are unfortunately all the same & know that consumers have little to no choice because of the structure of the telecoms market in SA. Only option is to cancel my contracts 1 by 1 and I am already 2 contracts down. Don’t expect any resolution from Vodacom nor for them to be bothered by this unhappy single customer whose spend with them is minuscule. All this would simply be resolved by the store giving me a new sim and the “correct” router so I can leave them alone but No.