You can pay HMRC for Self Assessment using the details provided in the link below. If you use a bank transfer to make payment then you will need your UTR number as the reference number to the payment as otherwise the HMRC will not know which Account to allocate your payment to.
If you need to contact HMRC - please call 0300 200 3310
https://www.gov.uk/pay-self-assessment-tax-bill
Normally you would set up a quarterly direct debit to pay for VAT. However if you do not have one in place, simply visit the below link. Again, you will need your VAT number to use as the pay reference to ensure HMRC can allocate the payment to your VAT account.
If you need to call the VAT office please call 0300 200 3700
As above you will require your 13 digit Accounts Office Reference number. If you are not sure what this is, you can reach out to your payroll administrator/ accountant to help you with this.
Again, you will require your Uniqute Tax Reference number for your Limited Company.
Official Entity Name AGR Accountancy LLP
Raj@agraccounts.com