How to change my s7 back to how the text, icons and turn the annoying voice lady off?

My phone did a system update while I was sleeping and now everything is messed up and this annoying lady won't shut up! How do I turn her annoying voice off? How do I get my text message back to its original color and size also change my icons back to what they were and to never have this issue again. The ladies voice is a number 1 get rid of

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