[Ethereum] How to get the balance of a contract using web3.js

I have deployed a contract as follows and determined its balance to be 5000 wei (value: 5000):

const thisContract = new web3.eth.Contract(abi);
thisContract.deploy({  
    data: bytecode,
    arguments: [ "0x84f0c8fC2F6bc8394EB77BaAAe89cB6e12C048C2", 86400]
}).send({
    from: "0x3455D7167A2EE2d660EE85F8e90C6b3B1cCB7163",
    gas: 5000000 ,
    gasPrice: '3000000000',
    value: 5000 // here I have determined the balance.
}, function(error, transactionHash) {
    console.log(error);
    console.log(transactionHash);
    console.log('function exec');
}).then(function(newContractInstance) {
    console.log('Contract Instance:' + newContractInstance.options.address);
});

I have deployed this contract on Tobalaba blockchain (its github is here.)

The balance of the address by which I developed this contract is 20000000000000000000 wei as follows :

> web3.eth.getBalance('0x3455D7167A2EE2d660EE85F8e90C6b3B1cCB7163').then(console.log)
Promise {
  <pending>,
  domain: 
   Domain {
     domain: null,
     _events: 
      { removeListener: [Function: updateExceptionCapture],
        newListener: [Function: updateExceptionCapture],
        error: [Function: debugDomainError] },
     _eventsCount: 3,
     _maxListeners: undefined,
     members: [] } }
> 20000000000000000000

However, when I get the balance of the contract, it's 0 as follows:

> web3.eth.getBalance('0xd227398f81bad20882b46ccdffc71058025df341').then(console.log)
Promise {
  <pending>,
  domain: 
   Domain {
     domain: null,
     _events: 
      { removeListener: [Function: updateExceptionCapture],
        newListener: [Function: updateExceptionCapture],
        error: [Function: debugDomainError] },
     _eventsCount: 3,
     _maxListeners: undefined,
     members: [] } }
> 0

And here is the information of deployment of this contract:

https://tobalaba.etherscan.com/address/0xd227398f81bad20882b46ccdffc71058025df341

Acoording to which the contract address is 0xD227398f81bAD20882B46ccdFfC71058025df341

Is something wrong?

IMPORTANT NOTE: I have developed this contract: https://programtheblockchain.com/posts/2018/02/23/writing-a-simple-payment-channel/

Meanwhile, when I get the contract address it returns null!