spamming their bile again

I have paid off any debt I had with GEMS after belonging to GEMS for only 4 months in early 2016. I even paid an amount I believe I didn't owe, to try and get MBD off my case. It took me 6 months to pay the amount off as I was unemployed at the time. AT THE END OF IT THEY SIMPLY CONTINUED TO HARASS ME. It has now been a year since I paid my final installment and throughout 2017 I have been harassed by MBD every single week. I have sent them my bank deposit slips and done everything in my power to get these people behave like rational human beings. Their ethos and inefficiency are beyond pathetic.