You may have to buy a pole replacement set, it includes pole sections, threading elastic and a threading tool. Keep the old poles until you have cut the new ones to length.
Beware of glass fiber splinters, wear gloves.
Measure the diameter of the existing poles accurately, there are several different diameters of poles used on various tents.
If the poles keep breaking then there must be a reason, is it being pitched correctly? I have never broken a pole in more than 20 years of using tents with fibreglass poles.
Vango are a huge force in the marketplace and a reputable company, it's difficult to believe they would use substandard poles! - I'd expect them to be as good as any.
Likewise with Bernie, in all the years of using FG poles, the only time I've had problems with breakage is in extreme wind, when to be fair, the tent shouldn't have been up in it anyway!
I'd be having a think (and check guying instructions, and maybe a few UTube videos) about how you erect the tent, suspect, extreme weather aside, that you may be doing something wrong to get so many repeated failures.
Are you using the original diameter poles? Thicker poles are not necessarily suitable, they won't always bend around the required arcs without being over-strained and consequently breaking.
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