Student Visa with wrong date

I applied for and just received my new UK student visa. However valid to date is wrong on my visa. The letter that accompanied the visa has the correct date but my visa has an incorrect date. The date on my visa says it is only valid till 25th Jan 2017, however the letter with the visa has the correct date which is 22nd Aug 2017. How do I go about getting this changed? I applied from outside the UK in Toronto, so do I have to go back to Toronto or can I get it adjusted in England?

The validity date on the visa vignette is for 30 days. You must enter the UK within that time and once here, within 10 days, you collect your BRP card which will be the full validity of the visa you applied for.

The letter should tell you this.