can i pay cash upon delivery?

Non you cannot, but you can ask some friend to pay it for you or you can buy a prepaid credit card rechargeable

You can use a Visa or Mastercard credit card (including prepaid), or a Visa Debit card to pay for your Fizz plans.

Other cards such as debit cards, American Express (Amex), Dinners, and others are not accepted. Foreign credit/debit cards are also not accepted. You also cannot use the funds from your Fizz Wallet to pay for your monthly plan.

Source: https://fizz.ca/en/faq/what-payment-methods-can-i-use

Hi Jannette

You cannot pay with cash or cheque. You must register a card on your account to use the service: https://fizz.ca/en/faq/what-payment-methods-can-i-use

However you are able to use a prepaid card. Here is an interesting article explaining prepaid cards:
https://www.greedyrates.ca/blog/prepaid-cards-canada/

If you're a new customer, don't forget to use a referral code during activation.
See here for list of available referral codes: https://community.fizz.ca/questions/2198337-place-referral-codes
Feel free to use mine. We will both receive a $25 credit each once you have made your second payment.