I bought proper running shoes before starting couch to 5k and have now been out 15 times, for around two miles. ( on week 5) My left foot how ever has now had the toes poking through the top of the shoe. It's only a wee hole but will get worse ... My husband thinks I should take them back as they aren't fit for purpose but I have had them since the start of March and worn them 15 times... Thoughts???