Worst experience with Mondo Mnt

after my 1st worst experience with Mondo last year, i decided to give them another short this year, only to find that they're service deilvery is still poor. i got that Mtn router Mtn made for home deal, they delivered a pocket router, yet the Sim card only work on the home router only. i queried with Mondo they told me maybe it's the coverage on my area. which i didnt understand because that what you check before giving the contract. i ended up returning it to the store on the 13th of August till today my contract is still not cancelled and i have been billed for something i dont even have.