they where from a breeder shes been breeding for over 25 years apparntly! they where very tiny and I'm sure under weight when i got them i felt like id resuced them if I'm honest! I'm mot sure if I'm gonna be able to get out yet this sinus infection is horrdendous

i feel like auch a bad piggie mum right now

x
Please don't feel bad. You are doing what you can. If you can order the enilconazole from Hyperdrug (UK) for next day delivery, that would help as that will stop the spread in its tracks. Please make sure that you sit down and use a basin on a wipeable floor to prevent injuries from blind jumps but don't have to bend down too badly yourself. A bathtub or the floor of a shower is best as your piggies cannot escape a confined space.
I have spent a decade of my life with chronic sinusitis, so I know how painful it is. Book a gp appointment for an antibiotic, please. Sinusitis is a bacterial secondary infection.
Unfortunately anybody can set themselves up as a breeder (or a rescue) without licence and control, and the results can be accordingly. You seem have fallen victim to one the baddies.

With shops you have generally better protection than with breeders. Unfortunately as long as they make some money out of their piggies, they will continue more.
That is the reason why we have a rescue locator on the top bar where we list vetted good standard rescues we can guarantee for you are in perfectly safe hands and won't have any nasty surprises as theiy conduct a mandatory quarantine/vet care, pregnancy watch and only put up healthy guinea pigs for adoption that are used to human handling.
If your breeder is officially advertising guinea pigs for sale on free-ads, you can complain to your local council over trading standards and also report her anonymously to the RSPCA although there is not likely much going to happen on the second score.