Оптимизация сайта на joomla3.2

I’ve never written bad reviews, but I can’t stand it. After the work of this type: first, the whole site floated, half of the functions and pages simply didn’t work, the styles all floated further nonewhere. He feared that he would do everything during the day and I paid for the service, which was very bad, by my confidence and honesty.
And the task he solved simply by installing a plugin!
Now after its manipulations on the site the infinite number of pages, the infinite generates 302, 303 redirect, Netpeak Spider finds the infinite number of non-existing pages.
That I don’t recommend this “worker” is slightly said.