Rain disgusting service's

Hi my name is pretisha rajaram I've been experiencing poor services form this network provider called rain I've requested a cancelation on my subscription b4 the new month and for sum reason rain didn't cancel my subscription now I'm sitting with a bill of 660 and I cnt afford also rain didn't advice me that once cancelation has been made I won't be able to port my number to another network which leave me in worry I desperately need my number and here they saying there's nothing they can do kindly assist me I hve all the prove stating that I've requested cancelation also I've been leaving rain so many msg through theys chat bolt askin for an agent to contact me but till date no1 has until I made contact rain isn't a free network u hve to hve airtime to call