Short: I don't think it's a glitch, unless you selected a 12 month contract.

Long: On a 12 month contract, a standard fibre installation is free.

The no-contract option costs $299 for the installation, which is what you're seeing.

But i already have fiber installed why would they need 200 dollars?!?

It's either a glitch or utter stupidity. You should not face that fee for a UFB plan change. 

Seriously, best to call Spark and ask them to do it manually and ask what they'll charge then.

They may still force you to buy the modem (or renew contract to get it for free) unless you were provided with one of the gigabit ones though.

i will give them a ring we have one of the older "Telecom" ones but we dont use it of course (We have a Fortinet) 

No contract option means you pay the install fee. 12 month contract will see that waived.

The fact you already have fibre installed is probably irrelevant to them...

Spark does not charge an install fee per se when changing fibre speed, but generally speaking we do recontract you for 12 months when you request a speed change. The reason for this is that the fibre network provider (Chorus, Enable etc) charge a fee to Spark (or any retailer) to change the speed at a network level. Rather than pass this fee direct to the end user, we recontract the end user instead.

It's hard to say what has happened online in your case, but I suspect if you choose the 12 month term, your $299 'install' fee will disappear. Please also note the Huawei 630b modem provided on low speed fibre connections (30/10, 100/20 etc) is not suitable for our 200/200Mbps plan. For that you need a Huawei HG659 gigbit modem, hence why our online system is attempting to send you one.