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I RECENTLY BOUGHT A 15GB DONGLE AS I HAVE CANCELLED MY INTERNET DUE TO MOVING SOON. IT SAYS I HAVE 90 DAYS TO USE MY 15GB BUT THERE IS ALSO A TAB FOR TOPPING UP. I HAVE NEVER USED ONE OF THESE BEFORE AND APOLOGISE FOR SOUNDING THICK BUT CAN I STILL USE THIS AFTER 90 DAYS BY TOPPING UP OR IS THE WHOLE THING ONLY GOING TO WORK FOR 90 DAYS. CAN SOMEONE PLEASE HELP? THANKS
There is no need to type in capitals, it is seen as shouting.
To answer your question the data pack is valid for 90 days or when the allowance has been used whichever comes sooner.
As you are PAYG there is nothing stopping you from purchasing a further data pack and continuing to use the service. Further information for you here: PAYG Top Up
and here: Topping up your mobile broadband