I fear I installed Spyware and I cannot fix it

I recently downloaded an app called "Translator" into my iphone. It never worked and it's not shown on my apps. Since then my phone is behaving with all the symptoms of being hacked. My battery lowers pretty fast, it jumps around and writes things by itself, etc. The App is not on the main screen and is not listed with the rest of the Apps on "Settings". I looked for solutions and found out that the App could be found within the normal "text Messages" App. There it was. So, I deleted it from there by left swiping and pushing delete. But, my phone is still behaving dodgy. Now what? Where is it?