delegateAmount()

[Kreeptonium]

I have tried using this library to build delegation. As per library it calls buyVoucher function internally.
But when I tried executing the validatorShare.addDelegation('xxx','xxx') then it didn't call the buyVoucher function. Instead it excuted the code & generated the hash below:
hash = 0xb2b224ccab3b600eedf775790ae746c4d526648e35ab094a75cd8dd883684894
I did delegation using metamask so the result was like below:
Approve(Hash): 0xca485e5b31a8b7cb0f087805114124167a006681ee788d7176122487122a123b
buyVoucher(Hash): 0x2c6dc671a522744216e43b7380c9bfea73337ddf7a4fc10f81eac99885e2a310

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Below is the code I have built to use addDelegation() function

import { Web3ClientPlugin } from "@maticnetwork/maticjs-ethers";
import { ABIManager, use } from "@maticnetwork/maticjs";
import { StakingClient } from "@maticnetwork/maticjs-staking";

import { providers, Wallet } from "ethers";
use(Web3ClientPlugin);

export const main = async ():Promise => {

let stakingClient = new StakingClient();

const VALIDATOR_ADDRESS='0xf903ba9e006193c1527bfbe65fe2123704ea3f99';

const from_Parent ='0xA70db639f26d907B7744e72c44e9f0562f6fb6Ce';
const from_Child ='0xd8C57108d94d5c528cE40Cc2d0cF5FcaB035614F';

try {

const parentProvider = new providers.JsonRpcProvider('https://goerli.infura.io/v3/8ff9246da3ee488487ee9bdf43e22d64');
const childProvider = new providers.JsonRpcProvider('https://polygon-mumbai.infura.io/v3/8ff9246da3ee488487ee9bdf43e22d64');

const PrivateKey_Parent='0x508516767f6XXXX32f4XXXXa1e5401145a1585XXXXc565df7d28fa0cf9fee1c3';
const PrivateKey_Child='0x9XXXXXX2bc7a0e50a24e5943d8776b2d86fdb06c4f6caXXXXXX5d3172b2928d5';

await stakingClient.init({

network: 'testnet',
version: 'mumbai',
parent: {
  
    provider: new Wallet(PrivateKey_Parent, parentProvider),
    defaultConfig: {
        from:from_Parent
    }
},
child: {
    provider: new Wallet(PrivateKey_Child, childProvider),
    defaultConfig: {
        //from:PrivateKey_Parent
        from:from_Child
    }
}

})

const abiManager = new ABIManager('testnet','mumbai');
await abiManager.init();

const validatorShare = stakingClient.validatorShare(VALIDATOR_ADDRESS);

var result=await validatorShare.delegateAmount('1000000000000000000','950000000000000000');

let hash = await result.getTransactionHash();
console.log("Hash: ",hash);
} catch (error) {

console.log("Error: ",error);

}
}

main().then(()=>console.log("Success"))
.catch((error)=>console.log("Error: ", error))

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It will be great help if you could provide solution on the above issue.