Fishless cycling using Dr Tim's One & Only live bacterial product

I'm still in the high nitrite phase and it's day 18 and my ammonia is zero (trace total ammonia) and nitrate level got to 10 ppm on Sunday and then stalled. I have only done two partial water changes due to high nitrite over 5 ppm.

I just removed my carbon filter today because I discovered it had zeolite in it. Is it true that zeolite can absorb ammonia and delay cycling?

I reached out to Dr Tim's customer service and first they blamed the Prime I used to originally condition my water. They also said not to add electrolytes into my water (my tap water is RO water) because I'm just creating chemical soup. They got "testy" when I asked about adding ammonia until it reads 2 ppm. They continue to claim that their product will instantly convert ammonia which is why I continue to get zero readings. They basically told me to bugger off if I dare listen to anyone's advice other than their own!
I think that their product is good but their customer service (or the particular rep that I had the misfortune to get) is probably the worst that I have ever dealt with. They didn't make one decent suggestion.

Wondering what to do next. Continue to add ammonia. Reseed with more bacteria? Any suggestions would be appreciated.