Shocking. No idea what they are doing

Frustrated beyond words. My cell C LTE routers stopped working. After numerous calls to various cell c numbers, I was informed that they were aware of the problems as they were no longer able to use certain MTN services and agreed to the cancellation of the contract as long as I returned the routers to the store. Attempted this, however the store refuses to take the device. After many many more calls I just left the routers in the store and informed them where and with whom. Still cant get confirmation that the contract has been cancelled or any details on a refund for services that I was unable to use.