Your seller lied. I've used ninja multiple times lasting weeks with it. I bought a month of Ninja and my kv was still unbanned when my time ran out.

I have gone 5 months on 1 kv with ninja your kv that you were using obviously was shared your kv seller lied.

I had a couple of shared KVs and they were lasting about the same as you mentioned. But i bought some unshared ones a while back and its been a good month or two on the same KV on ninja for me so far

Same with all the others when i had an rgh my kvs lasted months on ninja only time it lasted a few days is when i used the free servers check with your kv seller if you need to i know a good place to get unshared kvs for cheap also has instant delivery just pm me

Ninja Claims over a year, I've used ninja for A couple weeks and I've lasted long on shared kvs if we both had ninja, about 10 Days each shared kv. Unshared kvs should last easily a month. Check with your kv seller and switch seller if you need to, cheap is not always the best, try Some sellers like @Dream, he's legit as hell