Incoreect information received with contract update documentation

yesterday i upgraded 2 cell phone contracts I received quotation invoices to be signed and clearly stated that these must be completed and returned within 14 days... i have gne to the trouble of having these documents printed at a local print shop and signed them. as i didn't have a return email address i phone Vodacom upgrades for the email address only to be told "Oh no, you don't need to sign and return these changes a have already been completed" This has wasted my time money and petrol How will i be compensated for this by Vodacom