How to push data to storage and save it

Ionic Framework ionic-v3
1

saveContact(){
let d={“fname”:this.fname,
“sname”:this.sname,
“cname”:this.cname,
“phone”:this.phone,
“mob”:this.mob,
“email”:this.email,
“hphone”:this.hphone};

this.st.set(“k”, d);

this.event.publish("newuser");

}

and

refreshdata()
{
let loder = this.load.create({
content: “Loading Fresh Data…”
});

loder.present();

let items=this.st.get("k").then((Value) => {
  if (Value) 
  {
    this.name = Value.fname;
    this.phone = Value.phone;
    loder.dismiss();
  } else 
  {
    loder.dismiss();
  }

/* }, (erorr) => {
loder.dismiss(); */
});
}

if i try to save contact it will display only the present contact saved.previos one will not save.