MTN service is *******

I took my router for repair in December at the MTN south gate mall the one that is close to entrance 5 till today I have not received it, I have been visiting the store and they can't find it and spoke to the manager she tells me it's lost who's problem is it, sent emails they were supposed respond within 14 days nothing, this is my second review I writing regarding this and they have not responded. I paying monthly for nothing, I want my money back for endless visit , petrol and settle my account , I only used the router for one month it stopped working what ******* is this ,I want a respond and apologies for inconvenience cause because it's effecting my work. I have been responsible now they want drama and they will get it !