Answered question
When I have realised what to put as the PUK number it wasn't valid anymore do I really have to buy a new SIM card??? Or is there a way to activate it again?
You don't have to buy another SiM card, just follow this instruction. It's not about your SIM card, it's about your phone.
If you bought your phone from another mobile provider and want to use it on the Fizz network, you need to make sure your phone is unlocked.
Insert your Fizz SIM card (activated or not activated) into your phone.
When your card is inserted:
If you bought your phone from a Canadian provider after December 1, 2017, it is unlocked by default.
Because Fizz is not the company that locked your phone, we cannot unlock it. Only the provider who sold you your phone (and who locked it) can unlock it for you. Ask this provider’s customer service team for an unlock code and instructions for unlocking your phone.
Make sure you have your IMEI handy when you contact the company who sold you your phone.
An IMEI is your phone’s ‘identity card’. It allows you to obtain your unlock code. It’s also an anti-theft provision that allows you to identify and block your phone if it is lost or stolen.
If the number is more than 15 digits long, use only the first 15 digits.
Don’t remember where you bought your phone? Look in your phone’s settings to find the name of the original provider. Go to settings > cellular data > service operator.
Many mobile providers have tools on their customer support site that enable you to obtain your unlock code and instantly unlock your phone without having to contact customer assistance.
Other answers
Yes I do, so that means I need to buy a new SIM card and start the process all over again?
Actually, another thing that is fairly unique to Fizz is that the SIMS don't expire.